Chitoshi MASUDA
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Chitoshi MASUDATEL : 03-5286-3792 FAX : 03-5286-3792 e-mail : masuda-chitoshi@waseda.jp B.S. （1969, Waseda）. Dr. Eng （1986, Waseda）, Researcher （1971, National Research Institute tor Metals （National Institute et Materials Science）, （1986） Head ot Material Strength Division, |
Research
Evaluation of high specific strength materials and damage initiation and propagation mechanism of materials under the several environments are mainly studying in order to improve the reliability of the materials using several structures and to reduce the environmental pollution.
Metal matrix composites are one of the high specific strength materials. The reaction layer is formed between the fiber and matrix and the mechanical properties decrease with increasing reaction layer thickness because of the unavoidable reaction during the fabrication or practical applications. In order to improve the strength of the titanium alloy matrix composites, for the reaction layer thickness and the homogeneous fiber arrangement the fiber coated matrix alloy by PVD, monocomposites, are tested to obtain its strength. The composites arranged those monocomposites are compared the test data to discuss the fabrication conditions and the interfacial microstructures are examined. It is very high cost to make the monocomposites by PVD method. To homogeneous fiber arrangement, the ceramic fiber and matrix fiber are arranged and made the sheets fixed by bond. After that the foil/sheet/foil sandwich is pressed in furnace and consolidated to examine the interfacial microstructures and to evaluate the mechanical properties in comparison to the data for the composites fabricated by conventional method.
For several short fibers reinforced metal matrix composites the fiber distributions and those orientations are discussed in relation to the mechanical properties. For high efficiency of energy the copper base in-situ composites for the high strength and high electric conductivity are studying and for high reliability of structures the mechanical properties for steel having a fine grain size is discussed.
Representative publications
"Interface damage mechanism during high temperature fatigue test in SCS-6/Ti-15-3 composite", Met. Sci. Eng., A314, 110-117, （2001）
"Effect of interfacial properties on tensile strength in SiC/Ti-15-3 composite", Met. Sci. Eng., A276, 243-246, （2000）
"Effect of interfacial debonding and sliding on matrix crack initiation during isothermal fatigue of SiC/Ti-15-3 composite", Metal. Mater. Trans. A, 31A, 2637-2645, （2000）