Kinetics of the Martensitic Transformations in Au-Cd Alloys

Proceedings of the International Conference on Solid-Solid Phase transformations '99 (JIMIC-3)

Hiroyuki Saitoh*, Masayoshi Fujimoto*, Hiroshi ABE**, Ryuji Matsuo*, Michiya Takimoto*, Yoshie Matsuo*** and Ken-ichi Ohshima*

*Institute of Applied Physics, University of Tsukuba, Tsukuba 305-8573, Japan

**Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239-8686, Japan

***Department of Physics, Nara Women's University, Nara 630-8506, Japan

Martensitic transformation temperatures, Ms, Mf, As and Af, of an annealed Au-47.5at.%Cd-0.75 at.% Cu alloy were obtained by X-ray diffraction methods and electrical resistivity measurement. Four sets of the four values depend on the different X-ray wavelengths and the methods. The incubation time was observed during the isothermal holding between Ms and Mf, from the time dependence of electrical resistivity when the Kapton foil was used as the thermal insulation between the sample and the holder. The incubation time becomes longer when the temperature is close to Ms.

Keywords: martensite, kinetics, Au-Cd, incubation time, electrical resistivity, X-ray diffraction

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Department of Materials Science and Engineering
National Defense Academy

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