Makoto YOSHIDA
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Makoto YOSHIDATEL : 03-5286-3329 FAX : 03-5286-3329 e-mail : makoto-yoshida@waseda.jp URL:http://www.sci.waseda.ac.jp/research/ CONTENTS/J/15476112.html （1996）Dr. Eng. Waseda. Univ.,（1996～）Research Associate, Dept. of Mechanical Eng. Hiroshima Univ.,（2003）Associate Prof. Dept. of Mater. Sci. and Eng. Waseda. Univ. Annual paper award, Japan Inst. Metals. 2 times. Metal photograph award, Japan Inst. Metals |
Research
In this laboratory, R&Ds are focused on light weight materials, such as aluminum alloys, magnesium alloys and its composite materials, for automobile parts. We also study the shaping process of these, especially on the die casting. In order to reduce the weight of automobile and other transporters, replacement of materials from steels to light metals has been carried out. However, productivity（cycle time）, cost, properties and reliability must overcome conventional parts. As to the parts with complicated shape, casting process is one of the candidate to produce higher cost performance aluminum and magnesium alloy parts compared to forging, machining or other forming process. In order to apply die castings to structural parts, such as pillars, suspensions, or transmission cases, mechanical properties and its reliability are not necessarily sufficient. For example, various kind and size of defects should be included, such as gas porosities, shrinkage cavities, scattering chills, inclusions, and/or solidification cracking. Thus, it is necessary to forecast and control these defects before mass-production with the minimum trial casting. Furthermore, in order to optimize thermal and mechanical properties, methods of design and estimation of microstructure of materials are also main theme of this laboratory. As the topics of our study, in these days, we investigate the method of estimation and control of the solidification crack susceptibility of the Al-Mg-Si alloy and Mg-Al-Ca alloy parts with FEM analysis and high temperature tensile test in semi-solid region. Semi-solid material processing is also developed by using reological molding method. Equipments and themes of this laboratory are listed in the home page.
Representative publications
HREM and EDS Analysis of Sintered SiC Fiber Reinforced MAS Glass Composites J. Electron Microscopy 51（2002）S159-164
Characterization of heat insulating and lubricating ability of powder lubricants for clean and high quality die casting
J. Materials Processing Technology 130-131（2002）289-293
Influence of abnormal structure on the reliability of squeeze castings
J. Materials Processing Technology 130-131（2002）299-303
Fabrication of Aluminum Borate Whisker Reinforced AZ91D Magnesium Alloy Composites by Semi-solid Prcess and their Mechanical Properties
Adv. Composite Mater. Vol. 10, No. 2, 3, PP255-263（2001）
Influence of Growth Direction on the Microstructure of unidirectionally Solidified Cu-Pb Monotectic Alloy using Zone-melt Technique,（Ichiro Aoi, Makoto Ishino, Journal of Crystal Growth, Vol. 222（2001）, pp. 806-815.
Influence of Gravity on the Microstructure of Directionally Solidified Ag-Si Eutectic Alloy, Materials Transactions, JIM, Vol. 40, No. 1（1999）, pp. 27-33.