Language：English   Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

The deformation and fracture mechanism in 7075 aluminum alloy is discussed based on a field theoretical approach. A pair of peak-aged and overaged plate specimens are prepared under the respective precipitation conditions, and their plastic deformation behaviors are visualized with two-dimensional electronic speckle pattern interferometry (ESPI). The in-plane velocity field caused by monotonic tensile loading is monitored continuously via the contour analysis method of ESPI. In the plastic regime, the peak-aged specimen exhibits a macroscopically uniform deformation behavior, while the annealed specimen exhibits non-uniform deformation characterized by a localized shear band. The occurrence of the shear band is explained by the transition of the material’s elastic resistive mechanism from the longitudinal force dominant to shear force dominant mode. The shear force is interpreted as the frictional force that drives mobile dislocations along the shear band. The dynamic behavior of the shear band is explained as representing the motion of a solitary wave. The observed decrease in the solitary wave’s velocity is accounted for by the change in the acoustic impedance with the advancement of plastic deformation.

DOI： 10.3390/ma14061530

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DOI： 10.3390/app10165524

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DOI： 10.3390/ma13061363

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Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

Finite element model of gas pressure welding of steel bars is constructed in order to evaluate deformation behavior of the welded joint. The proposed model is based on a thermal-structural coupled analysis. Distribution of heat flux sourced from oxy-acetylene flame is assumed as a combination of two Gaussian functions, and heat losses due to convection and radiation are considered. Temperature dependences of thermal and mechanical properties of welding materials is modeled for the thermal-structural analysis. The analysis results show a good agreement with experimental results of variations of the temperature and the displacement on the weld center in the 20MPa to 40MPa range of the welding pressure. The proposed model revealed that tensile strain on the weld interface reaches larger value in the center than that in the outside of steel bar, depending on the temperature gradient. Additionally, the difference of the tensile strain between the center and the surface increases with increasing the upset force. It is considered that the temperature gradient on the weld interface is an important factor to control the deformation of gas pressure welded joint.

DOI： 10.2207/qjjws.38.418

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.3390/ma12244141

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DOI： 10.3390/met9050505

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DOI： 10.3390/app8071026

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Publishing type：Research paper (scientific journal)  

DOI： 10.1080/09507116.2017.1346895

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DOI： 10.1016/j.jmatprotec.2017.08.024

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Taylor and Francis Ltd.  

DOI： 10.1179/1743294415Y.0000000032

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DOI： 10.3390/app6060163

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DOI： 10.1016/j.ultras.2015.12.006

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DOI： 10.1016/j.jmatprotec.2015.10.031

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DOI： 10.3390/ma9020112

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DOI： 10.1134/S1029959916010057

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DOI： 10.1007/978-3-319-21765-9_17

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DOI： 10.1179/1743294415Y.0000000032

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Light Metal Welding Association  

DOI： 10.11283/jlwa.53.448

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DOI： 10.1080/09507116.2012.715888

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Trans Tech Publications  

DOI： 10.4028/www.scientific.net/AMR.922.332

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DOI： 10.1088/1757-899X/61/1/012006

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DOI： 10.4028/www.scientific.net/AMR.922.322

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DOI： 10.1179/1432891713Z.000000000321

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DOI： 10.1134/S1029959912010055

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DOI： 10.1179/1362171812Y.0000000066

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DOI： 10.2207/qjjws.30.298

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Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

DOI： 10.2207/qjjws.30.125

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：JAPAN WELDING SOCIETY  

DOI： 10.2207/qjjws.30.298

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.4028/www.scientific.net/AMR.409.820

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DOI： 10.4028/www.scientific.net/AMR.409.865

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DOI： 10.1179/1362171812Y.0000000066

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Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

The present study was aimed at producing new Ag-based filler metals that have a melting point lower than that of a conventional Ag-based filler metal (BAg-24) for brazing cemented carbide and possess the ability to provide a high strength joint of cemented carbide. Using an Ag-based filler metal with a lower melting point (BAg0) that was a quaternary alloy of Ag-Cu-Zn-Sn system previously developed by authors, and Ag-based filler metals with Ni or Co element added into the BAg0, cemented carbide rods were brazed. Bending strength of the joint and the brazed layer microstructure were investigated. The following results were obtained in this study.<br>Bending strength of a joint brazed at 650&deg;C using the BAg0 was about 85% that of a joint brazed at 750&deg;C using the BAg-24. When Ni element was added into the BAg0, intermetallic compounds were formed in the brazed layer, and bending strength of a brazed joint was decreased. By adding a small amount of Co element into the BAg0, bending strength of a joint brazed at 650&deg;C was improved and was equivalent to that of a joint brazed at 750&deg;C using the BAg-24. However, excessive addition of the Co element made the bending strength of a joint decreased.

DOI： 10.2207/qjjws.29.204

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DOI： 10.1179/1362171811Y.0000000037

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DOI： 10.1016/j.surfcoat.2011.02.025

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Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

Authors tried to develop a new nickel-based brazing filler metal containing no boron and phosphorous to suppress the formation of brittle phases in a brazed layer. The properties of a joint brazed using the new filler metal were investigated and compared with those of a brazed joint using a conventional nickel-based filler metal of BNi-5. The following results were obtained in this study.<br>A new nickel-based brazing filler metal was successfully developed, which contains a small amount of Si and Mn and shows the melting temperature lower than about 1090&deg;C. The hardness of the new filler metal was about 40% that of BNi-5 filler metal containing about 10% Si.<br>In brazing of SUS304 stainless steel, using BNi-5 filler metal, a hard and brittle finally-solidified region appeared in the brazed layers with joint clearance over 100&mu;m. However, using the new filler metal, the finally-solidified region appeared in the brazed layers with joint clearance over 200&mu;m. The hardness of the finally-solidified region in the brazed layer using the new filler metal was about 54% that using BNi-5 filler metal.<br>The tensile strength of a SUS304 joint brazed using BNi-5 filler metal extremely decreased at joint clearance over 100&mu;m. On the other hand, the tensile strength of a joint brazed using the new filler metal decreased at joint clearance over 200&mu;m. It seems that the brittle finally-solidified region formed in a brazed layer causes the joint to decrease the tensile strength.<br>It was shown that the newly developed filler metal is superior to the conventional BNi-5 filler metal in hardness and in tensile strength of joints with wider joint clearance.

DOI： 10.2207/qjjws.29.241

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Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

DOI： 10.2207/qjjws.28.255

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DOI： 10.2207/qjjws.28.80

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jmatprotec.2010.05.015

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Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

DOI： 10.2207/qjjws.28.402

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Language：Japanese  

DOI： 10.2355/tetsutohagane.95.483

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Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

DOI： 10.2207/qjjws.27.202

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Language：Japanese  

DOI： 10.2320/jinstmet.73.255

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2320/matertrans.L-MRA2007886

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DOI： 10.1016/j.jmatprotec.2007.06.012

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2355/isijinternational.47.1016

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Language：Japanese   Publisher：The Japan Institute of Light Metals  

DOI： 10.2464/jilm.57.191

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Language：English   Publishing type：Research paper (international conference proceedings)  

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DOI： 10.1299/jsmec.49.334

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.surfcoat.2006.03.018

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.wear.2005.07.010

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2355/isijinternational.45.1887

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DOI： 10.2355/tetsutohagane1955.89.12_1227

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Language：Japanese   Publisher：The Iron and Steel Institute of Japan (ISIJ)  

DOI： 10.2355/tetsutohagane1955.89.11_1178

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J-GLOBAL

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DOI： 10.1016/j.procir.2022.09.157

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DOI： 10.1007/978-3-030-59773-3_1

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Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

DOI： 10.2207/jjws.87.388

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DOI： 10.1007/978-3-319-62899-8_11

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DOI： 10.1007/978-3-319-63028-1_2

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Language：Japanese   Publisher：Japanese Society for Engineering Education  

DOI： 10.20549/jseeja.2017.0_290

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Language：English   Publisher：Japanese Society for Engineering Education  

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DOI： 10.1007/978-3-319-41600-7_3

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DOI： 10.1007/978-3-319-21765-9_16

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DOI： 10.1007/978-3-319-21765-9_18

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DOI： 10.1007/978-3-319-06986-9_13

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DOI： 10.1007/978-3-319-06986-9_11

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DOI： 10.1007/978-3-319-06986-9_15

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Language：Japanese   Publisher：JAPAN WELDING SOCIETY  

DOI： 10.2207/jjws.83.204

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Language：English   Publisher：The Japan Society of Mechanical Engineers  

The intermetallic compound Fe_3Al was processed by a reactive sintering process, and its machinability was investigated using dry turning. In cutting Fe_3Al with a cemented carbide tool, the tool life was approximately one tenth that of cutting carbon tool steel SK3 because of intense flank wear. The tool life for cutting Fe_3Al using the cemented carbide P20 tool was longer than for cemented carbide K10, and a cermet tool reached its tool life limit by chipping for the whole cutting speed range measured. The roughness of the machined surface of Fe_3Al cut using a cemented carbide tool was much smaller than for SK3. However, for cutting using the cermet tool, the roughness showed a sharp rise due to chipping. It was found that tool wear could be attributed to the removal of reinforcement particles. The cemented carbide P20 is suitable for cutting Fe_3Al, and further, highly accurate cutting is possible for Fe_3Al because of the good surface finish.

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The ultrasonic horns with cylindrical concave surfaces (concaved horn) have been designed and the effect of the concave on cavitation bubbles generation in water has been investigated. High speed camera observation was made on the vibrating horn tip in water and the generation behavior and the impact force of the cavitation bubbles were investigated. In the measurement of impact force, load vibration occurred as the cavitation bubbles collapsed, and peak frequencies were observed at the vibratory frequency of the horn and its harmonic frequency. The impact force was evaluated based on the above peak frequency. The result showed that the concaved horn provide the higher impact force compared to the horn without the concave. Frequency analysis of the load vibration showed that the concaved horn enhanced the generation of cavitation bubbles in the number. The distribution of cavitation bubbles on the horn-tip was evaluated using high-speed image. It was confirmed that the cavitation bubbles flow was effectively converged to the center of concave.

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Event date： 2016

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Residual stress induced by brazing and bead welding have been analyzed based on acousto-elasticity and optical interferometry. Acousto-elasticity is to probe compressive or tensile residual stresses from acoustic velocity measurements and optical interferometry is to measure strain induced by an external tensile load. It has been theorized that a compressive residual stress increases the elastic modulus and that an external tensile stress reduces the increase in the elastic modulus. From the tensile stress that brings back the elastic modulus to the nominal value, the residual stress can be estimated. Compressive residual stresses have been estimated in this fashion for a butt-brazed and a butt-bead-welded steel specimens to be of the order of 5 MPa and 50 MPa respectively.

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Event date： 2016

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Spatiotemporal behaviors of the shear band have been analyzed. Based on a recent field theory of deformation and fracture, it has been hypothesized that (a) a shear band is formed along the boundary of opposite rotational displacements of a specimen. (b) When the propagation velocity of movable dislocations along the front of a shear band is higher than the phase velocity of the rotation wave the shear band appears continuously whereas when the velocity of the dislocations is lower than the rotation wave the shear band travels at the same velocity as the rotational wave appearing intermittently. Electronic-Speckle-Pattern Interferometric setup has been used to monitor the formation and movement of shear bands under various tensile strain rates. The observed spatiotemporal characteristics of the shear bands have been found to support the above hypotheses.

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Event date： 2016

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In this study, Electronic Speckle Pattern Interferometry (ESPI) and acoustic microscopy were applied to analysis of the fatigue of aluminum alloy. Effect of fatigue damage on the macroscopic deformation behavior during a tensile test has been analyzed with the interferometric fringes. Resultant fringe pattern showed that the elastic compliance in the damaged area increased as the fatigue cycle before the tensile test (Pre-fatigue cycle) increased, resulting in the occurrence of strain localization. In order to know the relation of between the deformation behavior and the microstructural change of the specimen, the acoustic property on the surface has been investigated by a scanning acoustic microscope. It was found that the surface acoustic velocity in the load direction in the pre-fatigue test increased with increasing the pre-fatigue cycle. The results have been discussed based on the fatigue stages of the change in residual stress, local plastic deformation, and the crack initiation.

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Event date： 2015.7

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We investigated the spontaneous recurrence of deposition and dissolution of camphor layer on the surface of camphor methanol solution. This recurrence is a novel rhythmic process concerned with solid-liquid phase transition. To elucidate the underlying mechanism, we measured the solution temperature at different times, and found that the temperature increased, and decreased repetitively, correlating with the camphor layer's deposition and dissolution. These experimental results show that the solution temperature plays an important role in recurrence of deposition and dissolution.

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Serration phenomena of AA5083 alloys with various crystal grain sizes during tensile tests were visualized using Electronic Speckle Pattern Interferometry. The behavior of deformation band during the plastic deformation associated with the serration was investigated by a dynamic observation of the images of displacement contours. The characteristic in the serrated curve varied depending on the grain size of specimen and the applied total strain at which the deformation band appeared. The occurrence and propagation processes of the deformation band observed in the displacement contours were investigated being compared with the serrated curve in the load. The correlation between the band propagation and the serrated curve, and the difference in the behavior of band propagation by the grain size were discussed based on the variations in the magnitude of the load drop and the velocity of the moving deformation band.

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Event date： 2012.9

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Event date： 2010

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Authors ultrasonically welded A6061 aluminum alloy sheet using two types of weld tips with the different contact face geometry, and investigated the effect of the weld tip geometry on the performance and the interface structure of welds. One type of tip has a cylindrical contact face without knurl, which is called C-tip in this study The other type of tip has flat contact face with knurl, which is called K-tip in this study. The strength of the joints welded using C-tip was higher than that welded using K-tip and the C-tip could stably produce the higher strength joint.

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Event date： 2010

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Ultrasonic welding between SS400 mild steel sheet and aluminum alloy A5052 sheet containing magnesium was conducted. In this study, authors investigated the influence of ultrasonic welding condition on the mechanical properties and the interface microstructure of a joint, and examined the effect of an insert metal to improve the joint strength. The main results obtained in this study are as follows.It was possible to ultrasonically weld SS400 mild steel sheet and A5052 sheet. When the clamping force was varied keeping the welding time constant for 1s, the joint strength showed the maximum at the clamping force of 588N and it decreased with increasing the clamping force because the frictional action at the interface decreased with it. When the clamping force was kept constant at 588N and the welding time was varied, the joint strength reached the maximum at the welding time of 2.5s, followed by decreasing in the joint strength welded at 3s welding time due to the formation of Fe2Al5 intermetallic compound at the interface. Using insert metal of commercially pure aluminum successfully improved the joint strength and the strength of the joint welded at 3s welding time was about three times larger than that without the insert metal.

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Event date： 2008.9

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The dissociation mechanism of excited CH2X2 (X = Cl, Br) was investigated using charge-inversion mass spectrometry, in which positive ions collide with an alkali metal target to generate neutral fragments, and the negative ions formed from the neutral fragments are mass analyzed. Different relative abundances of the negative ions were observed in the charge- inversion spectra for CH2Cl2 and CH2Br2. The kinetic energy release values calculated from analysis of the peak associated with CHCl2- in the charge-inversion mass spectrum of the parent CH2Cl2+ ion indicate that the excited CH2Cl2 formed by neutralization dissociates spontaneously into CHCl2 + H. (c) 2008 Elsevier B.V. All rights reserved.

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Event date： 2008

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The Fe-Al intermetallic compounds have a high hardness and superior resistance against a wear, a heat and an oxidation. Therefore it is expected that the compounds will be used as a tool material and a high temperature structural material for a chemical plant, a turbine, a catalyst and so on. Although the intermetallic compounds are typically formed by near-net shape methods such as sintering or casting because of their poor ductility and plastic deformability, machining is required as a finishing method to form a highly accurate product. Some studies on the machinability of the intermetallic compounds have been reported so far, which reports about the cutting such as the lathe turning mainly. Additionally, there are few reports about machinability of the single phase. The main purpose of this study is to clarify the fundamental slicing characteristic of the single phase body of the Fe-Al intermetallic compounds. The main results obtained are as follows. The machinability of the Fe-Al intermetallic compounds is inferior comparing with the hard and brittle materials such as Pyrex or polycrystalline silicon, and then the multi-wire saw is available for the high precision slicing.

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Event date： 2008

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As investigation of the relation between adhesion on rake face of tool and machined surface for some commercial aluminum alloys, the following result was obtained. The adhesion appeared on the rake face has two types, in the former type, adhered material on the rake face was thin and the evaluation of adhesion area varied. In the latter type, adhered material on the rake face was thick and the evaluation of adhesion area was stable. In the case of thin adhesion, the surface roughness after machining Ra has small value and increase with increasing adhesion area A. On the other hand, in the case of thick adhesion, Ra has large value and decrease with increasing A.

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Event date： 2008

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Al-Si Alloys which contain 0-2mass%Si were processed and machined by dry cutting in order to clarify effect of solid soluted Si on machinability of Al-Si alloy. In work material containing 0-1.5mass%Si, adhesion stacked on cutting edge widely and the surface roughness was increased with increasing the content of solid soluted Si. On the other hand, in the work material containing above 1.5mass%, adhesion on cutting edge spread thinly compared with other work materials and surface roughness was decreased. Moreover, eutectic Si was confirmed on machined surface in work material containing 2mass%Si. From those result, it was considered that solid soluted Si increased surface roughness.

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Event date： 2008

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To investigate the relationship between composition and machinability of Fe-Al system intermetallics, orthogonal cutting was performed for some aluminum content of Fe-Al alloy. In the case of small depth of cut, the machined surface of low the aluminum content alloy was smooth, and many cracks were appeared in the high aluminum content alloy. This tendency was more prominent in the case of large depth of cut. Chip shape of the low aluminum content alloy was flow type. However, in the high aluminum content alloy, it was divided into parts finely.

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Event date： 2007

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Relationship between operatability of excretion support equipment for wheelchair users and grip diameter of controller had been investigated. Length from the controller to the actuator had an optimum value related the length of user's hand. The optimum length in this study was 350mm. Moreover, the diameter of grip had an optimum range from 20mm to 35mm. This diameter range was smaller than that of power grip. It is understood that the operations in this study were precision grip concerned with the fingertrip.

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Event date： 2007

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The surface of a layered material was observed by electronic speckle pattern interferometry under the tensile test. Characteristics patterns as white points or lines were observed by electronic speckle pattern interferometry with crack generation. The crack generated on the surface was compared with the pattern. the position of the pattern corresponded with the position of the crack which was observed by microscope.

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Event date： 2007

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High-temperature aluminaizing which is diffusion process at a temperature higher than 950℃ make a Fe-rich alloy layer. The tensile test was done for the high-temperature aluminized steels which have the Fe-rich alloy of aluminum solid soluted ferrite on the surface of carbon steel. As a result, tensile strength of aluminized steels was 1.4 times of that of the carbon steel.

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Event date： 2007

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The feeling of a wood-screw tightening using a screw driver has been examined. As a result, The screw driver cam be rotated when the screw driver bit size is smaller than the cross-grove size of screw head. However, the operation time of screw closing become long as those incompatibility degree increases. It has been understood that thess cause are the stability during screw driver operation at the early stage of screw tighening. Moreover, increasing the wood hardness tends to in crease the operation time, fatigue, the feeling of a wood screw tightning and the feeling of grasping.

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Event date： 2006

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In this report, Al-Si alloys which contain 2-25mass%Si was processed and machined by dry cutting in order to clarify effect of eutectic Si particles and primary Si particles on machinability of Al-Si alloy. The number of chips per unit weight was rapidly increased in machining specimens containing more than 15mass%Si. Moreover, Chip thickness and curl radius decrease with increasing the eutectic Si. It was found that these are due to higher hardness of matrix caused by eutectic Si particles. Therefore, it is considered that the crack of primary Si which act as a nucleus of chip breaking grow up, and thereby the increase of number of chips was promoted.

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Event date： 2006

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Bending properties of Al-20%Si alloys machined by dry cutting and wet cutting are investigated in this report. Primary silicon of average size of 27μm and eutectic silicon of average size of 5μm are observed in the specimen. The bending stress was increased in order of the specimen machined by dry cutting, machined by wet cutting and polished. The machined surface by dry cutting was rough due to the detaching of the built-up edge during machining. For the machined surface by wet cutting, cracks were observed near the primary silicon particles. The decreasing of bending stress are probably due to that the splitting of the material in dry cutting is larger than the crack of primary silicon in wet cutting.

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Event date： 2006

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Ti-Ni system alloys are processed by solid phase diffusion at 800℃ after nickel plating on titanium foils in this report. Intermetallic compound layers of Ti_2Ni, TiNi and TiNi_3 were observed in the specimens by the diffusion. TiNi layer was formed at longer diffusion time than 6h, and the thickness increased proportionally to square root of the diffusion time, t. Voids due to Kirkendall effect were observed in Nickel layer. Additionally, the number of voids increased with increasing diffusion time. However, it is clarified that the intermetallic compound layers without the voids are obtained inside of the specimen by using this method.

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Event date： 2006

Language：Japanese  

Machinability of Ti-47.7at% Al intermetalli compound having TiAl-Ti_3Al full lamella structure is investigated by orthogonal cutting test using cemented carbide tool K10. Defects such as cracks, peelings due to brittle fracture along with the direction of lamella were observed on the machined surface. The larger brittle cracks were occurred in cutting by tool with the rake angle of +5°. For machining in the rake angle of -5°, the depth of crack occurrence was independent on the direction of lamella. On the other hand, for machining in the rake angle of +5°, it increased rapidly at the lower angle between lamella direction and cutting direction than 90°.

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Event date： 2006

Language：Japanese  

Effect to the machinability of S25C steel with changing cooling rate and Boron content (S25CB) has been investigated by turning using cemented carbide tool P20. It was found that the tool wear and surface roughness for cutting S25C were lager than that for S25CB in annealed steels. However, in water(20℃) and cold water(0℃) cooled steels, the tool wear and surface roughness for cutting S25CB resulted larger than that for S25C. Moreover, chip length for cutting S25C was longer than that for S25CB in all cooling rate steels.

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Event date： 2006

Language：Japanese  

To obtaion imformation about temperature fluctuation to oparate the TiNi actuator, sensory evaluation tests for temperature fluctuation has been performed. At the leaved parts from the center of the body like finger tips of hand and foot, it was found to be able to endured the wider temperature fluctuation region at lower temperater from the temperature of body than that at higer temperature. In addition,at near parts the center of the body such as arm and leg, it became clear that there was no diffrence in the sensory evaluation value at high temperater and low temperartre compered with the temperature of body.

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Event date： 2006

Language：Japanese  

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Event date： 2006

Language：Japanese  

Machinability of Al-Mg-Si alloy is investigated using an orthogonal cutting test. The yield stress and elongation rose by increasing Mg_2Si content. This tendency was prominent in the aging condition of T6 (Aging at 180℃ after solution heat treatment). On the other hand, the yield stress and elongation increased largely by addition of excess Si in the whole aging condition. The cutting resistance of a material added excess Si (C5) was smallest, and the burr formation at the edge of work was suppressed. In the aging condition of T6, the cutting resistance was large because of large strength of work and thickness of chip. The width of burr decreased by prestraining of 10 percent before machining.

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Event date： 2006

Language：Japanese  

In order to investigate the influence of second-phase particles on chip breakability of aluminum alloys, turning test for various wrought aluminum alloys were carried out with carbide inserts (K10) in dry and wet cutting conditions. In the materials, Al_2Cu, Al_6Mn, Mg_2Si, Al-Fe-Si system compound and eutectic Si were observed as second-phase particles. Chip breakability of materials which containing Al_2Cu or Si as second-phase particles were superior than that of materials with Mg_2Si or Al-Fe-Si system compound. This tendency was more prominent in wet cutting than in dry cutting. The Al_2Cu and Si particles on the machined surface were fractured by cutting tool in machining. It was estimated that those fractured second-phase particles acted as nucleus of chip breaking during machining. Moreover, the increase of the chip breakability in wet cutting was attributable to the promotion of fracture of Al_2Cu and Si particles due to the Rehbinder effect.

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Event date： 2006

Language：Japanese  

Machinability of Ti-47.7at%Al intermetallic compound having TiAl-Ti_3Al full lamellar structure is investigated by orthogonal cutting test using cemented carbide tool K10. Defects such as cracks, peelings due to brittle fracture along with the direction of lamellar were observed on the machined surface. The larger brittle cracks were occurred in cutting by tool with the rake angle of +5°. For machining in the rake angle of -5°, the depth of crack occurrence was independent on the direction of lamellar. On the other hand, for machining in the rake angle of +5°, it increased rapidly at the lower angle between lamellar direction and cutting direction than 90°.

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Event date： 2005.10

Language：English  

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Event date： 2005

Language：Japanese  

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Event date： 2005

Language：Japanese  

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Event date： 2005

Language：Japanese  

Intermetallic compound Fe_3Al (Fe-16mass%Al) has been processed by reactive sintering process, and the machinability has been investigated by dry turning. In cutting Fe_3Al by cemented carbide tool, the tool life were approximately one tenth of that in cutting carbon tool steel SK3 because of intense flank wear. The tool life in cutting Fe_3Al by P20 was longer than K10, and cermet tool reached to tool life by chipping at the whole cutting speed measured. The roughness of finished surface in cutting Fe_3Al by cemented carbide tool was mach smaller than SK3. However, in cutting by cermet, the roughness showed a sharp rise due to chipping. Cemented carbide P20 is suitable for cutting Fe_3Al, further, highly accurate cutting is possible in Fe_3Al because of for the good finished surface.

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Event date： 2005

Language：Japanese  

Machinability of lathe machining and drill machining in structural carbon steel S25C material and S25C contained boron steels (S25CB002) have been investigated. It was clear that the tool wear of flank face in lathe machining were remarkable at boron contained steel S25CB002 than that of at S25C. Moreover, the tool wear of drill machining were larger than that of S25C.

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Event date： 2005

Language：Japanese  

To improve the machinability of precipitation hardened aluminum alloy, turning tests have been performed for Al-4mass%Cu and Si added Al-4mass%Cu alloys. The chip breakability improved and surface roughness increased in over aged Al-4mass%Cu alloys at dry and wet cutting conditions. On the contrary, in Si added Al-4mass%Cu alloys, chip breakability more increase at heat treated condition from solution to peak aged at wet cutting condition than dry cutting condition. Moreover, from tensile tests for these alloys at wet and dry environment, fracture elongation decrease at Si added Al-4mass%Cu alloys at wet condition. And, from SEM observation of breaked chip surface for those Si added alloys, as ovserved inter-phase fracture of Si particles by deformation, chip breaking during wet cutting of Si added Al-4mass%Cu alloys controlled by Rebinder effect of lubricant.

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Event date： 2005

Language：Japanese  

Relation between tool life and work hardening in cutting austenitic stainless steel is investigated by turning. The tool life is long in rank order of S35C-H, SUS304, SUSS16 and S35C-O, and tends to be short as hardness of material before machining is high. In result of observation of section through the finished surface of specimen and hardness measurement, tool cuts work hardened layer, HV=350-400, for stainless steels, especially SUS304, more work hardened layer, HV=580, is observed at 10μm depth from surface. It has been clear that the tool life was possible to be ruled by maximum hardness in work hardened layer.

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Event date： 2004.3

Language：Japanese  

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Event date： 2004

Language：Japanese  

Cause of difficultly to machine austenitic stainless steel was studied by turning with new tool or wore tool. In cutting of SUS304 with wore tool, Vichers hardness at surface reached 600 against approximately 300 at inside. We thought it was because strain induced martensitic transformation generated at surface of SUS304.

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Event date： 2004

Language：Japanese  

The machinabilities of aluminized steels were investigated by turning. The tool wear in cutting aluminized steels diffused at 1223K were more remarkably than steels as hot-dip aluminum coated, and the edge retreat amount increased with lengthening diffusion time TD. Three intermetallic compounds which were Fe_3Al, FeAl and Fe_2Al_5 formed to the diffusion layer of diffusion treated steels. In cutting frequency N was small, the machined surface roughness of diffusion treated steels were large because Fe_2Al_5 formed near the surface diffusion treated steels ware brittle fractured by impact while cutting. And, in N was large and Fe_3Al and FeAl were cut, the machined surface roughness were small. However, these intermetallic compounds caused temperature-rise and r remarkable tool wear.

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Event date： 2004

Language：Japanese  

Structures of deformed layer generated by cutting of eutectoid steels and effect of cutting conditions were investigated. In cutting of eutectoid steel with spheroidal cementite structure, cementite was hardly deformed but traces caused by deformation of fearlite were observed. The area observed traces increased as rake angle in tool decreased. In cutting of eutectoid steel with pearlite structure, structures of deformed layer were differ in direction to cementite against longitudinal direction to work piece, and in case, direction to cementite was perpendicular to longitudinal direction to work piece, fracture and bend of cementite were observed, and in case, direction to cementite was parallel to it, division, slide and bend were observed. In martensite structure, thick layer was observed to outer layer and size of crystal in this layer was nano level.

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Event date： 2004

Language：Japanese  

As the basic research of development of composite material using aluminum can and glass both were often used as a recycling material, work pieces whish glass particles homogeneously dispersed to pure Al powder were sintered by hot press. And mechanical properties and machinability in turning of these composites were investigated. By dispersing glass particles, hardness of alloys was increased and chips were broken into small pieces. On the other hand, conditions of machined surfaces were roughening with increasing glass particle contents. Moreover cutting force was decreasing with increasing glass particle contents.

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Event date： 2004

Language：Japanese  

The effect of grain size and volume fraction of Si Particle on machinability of aluminum alloys in turning was investigated. Powders of pure Al and Al-Cu alloy were used as matrix and to disperse Si particles homogeneously, work pieces were sintered by hot press By dispersing Si particles, hardness of alloys were increased and chips were broken into small pieces. This tendency was remarkable in Si dispersion alloys based on Al-Cu. On the other hand, conditions of machined surfaces were roughen with increasing Si contents, and this tendency was slightly stronger in Al-Cu alloys than that of Al alloys.

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Event date： 2004

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Event date： 2004

Language：Japanese  

The machinabilities of intermetallics FeAl having various aluminum contents formed by reaction sintering were investigated by turning. Hardness of FeAl increase with increasing aluminum content. Tool wear in machining FeAl was mainly flank wear. Tool life decreased with increasing aluminum contents and this tendency was remarkable at higher than cutting velocity 1.0m/s. Machined surfaces of FeAl were smooth and clear cutting mark was found on surface at cutting velocity 0.5m/s. However, at higher than cutting velocity 1.0m/s, cutting mark was unclear and clack was found on surface of hard material having higher aluminum content. It was suggested that critical cutting velocity of FeAl using cemented Carbide P20 is about 0.5m/s.

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Event date： 2004

Language：Japanese  

Machinability of Fe_3Al(Fe-16wt%Al) intermetallic compound for tungsten-carbide tool P20 was investigated by turning. Flank wear of cutting tool increases rapidly with increasing cutting velocity and the critical cutting velocity of Fe_3Al for P20 was about 0.5m/s. Difference of hardness of Fe_3Al and that of SK3 used as comparative material was small, but tool life for Fe_3Al was much shorter than that for SK3. It was suggested that the tool life shortening for Fe_3Al was caused by diffusion of tool material at high cutting velocity. As the tool wear of Fe_3Al was remarkably at higher cutting velocity, but machined surfaces of Fe_3Al were smooth than SK3.

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Event date： 2004

Language：Japanese  

The aluminum matrix composites reinforced with Al_2O_3 particles were processed and the effect of Al_2O_3 particles on the machinabilities of these composites were investigated. As a result, the measured Vickers hardness values rose remarkably in a critical penetrated depth of indenter. And, the critical penetrated depth increased with increasing particle volume fraction and particle size. The dependence of volume fraction and particle size on the flank wear in turning were remarkable in the depth of cut smaller than the critical depth of Vickers indenter.

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Event date： 2004

Language：Japanese  

The effect of stress inducted martensitic transformation on the machinabilities of austenitic stainless steels (SUS301, SUS304 and SUS316) were investigated. The yield stresses of all steels were almost the same and the work hardening were remarkable in the order of SUS301, SUS304, SUS316. The scatters and mean values of hardness distribution in tensile deformation were large in the order of SUS301, SUS304, SUS316. And tend similar to the work hardening. Moreover, these tendencies were observed in the roughness of machined surface. The machinabilities in turning of austenitic stainless steels were discussed by the relationship of the hardness and the stress inducted martensitic transformation.

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Event date： 2003.4

Language：Japanese  

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Event date： 2003

Language：Japanese  

Two type of aluminizing test for carbon steel have been performed. The one was diffusion treated after soaking in molten aluminum bath. The other was diffusion treated after preheating where put carbon steel into aluminum foils and pressed y the ceramics plates. Later case of aluminizing test had more thin and uniform film than that of the former case. Moreover, at the diffusion treatment, more thick ductile film were formed in later case.

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Event date： 2003

Language：Japanese  

The hardness of Al-Al_2O_3 materials were measured at the condition of the applied force of indenter was widely changed to examine the contribution of each phase of dispersion hardened materials. The hardness scatter of Al-Al_2O_3 materials were larger as the single phase materials such as pure Al and Al_2O_3 materials, is especially at the low applied force conditions and at the Al-Al_2O_3 materials of high Al_2O_3 volume fraction. The hardness scatter came to decrease as the applied force F=5N or more it decreases to the same extent as the single phase material. The scatter of hardness under low applied force forms two or three groups, and it has been understood that the hardness of the matrix and dispersion phase appears in the lower group and the higher group, respectively.

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Event date： 2002.10

Language：Japanese  

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Event date： 2001

Language：Japanese  

To make clear the wear property of Fe-Al intermetallic compounds, the five specimens of Fe_3Al, FeAl, FeAl_2, Fe_2Al_5 and FeAl_3 were subjected to abrasion tests using abrasive paper with some grain size. In FeAl_2, Fe_2Al_5 and FeAl_3 specimens with relatively high Al composition, the wear surface translated from ductile wear surface into brittle wear surface with chipping at the specific size of abrasive grain. The effect of applied force per abrasive grain on this ductile-brittle transition was discussed from the relationship between micro cracking condition in indentation test and grain size on abrasive paper.

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：長岡技術科学大学  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：日本大学 郡山キャンパス  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：日本大学 郡山キャンパス  

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Language：English   Presentation type：Poster presentation  

Venue：Cairns, Australia  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：電気通信大学  

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