Youichi Watanabe1, Toshio Saburi2, Yutaka Nakagawa3 and Soji Nenno4
1Graduate Student, Osaka University, Suita
Self-accommodation process and the resulting structure of the orthorhombic martensite in a Ti-Ni-Cu shape memory alloy were investigated.
Observations of the self-accommodation process of habit plane variants of the orthorhombic Ti-Ni-Cu martensite were made by transmission electron microscopy, and the three-dimensional configuration of the variants resulting from self-accommodation was analyzed.
The results obtained are as follows.
(1) The fundamental unit of the self-accommodation structure in three-dimensions is cuboidal, consisting of six different variants. This structure appears to be a triangular when observed in the <111>P direction (P: Parent).
(2) The six variants are twin related with each other and two types of twin relations exist among them. One is the (111)MM type I twin and the other is the (011)MM compound twin (M: Martensite).
Then, on the basis of the observed relations among the variants the deformation process of the orthorhombic martensite was discussed.
martensitic transformation, shape memory alloy, titanium-nickel alloy, titanium-nickel-copper alloy, electron microscopy, self-accommodation, variant configuration
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