<報文>TiNi合金のマルテンサイト変態に及ぼすCu添加の影響

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In order to clarify the mechanism of the martensitic transformation of TiNiCu alloy, effects of Cu addition on shape memory effect, Ms temperature, heat of transformation, lattice parameter, tensile property, thermal dilatation and Vickers hardness were examined. The results obtained are as follows : (1) A remarkable shape memory effect was observed in TiNi_<1-x>Cu_x (x=0〜0.4). (2) Ms temperature of TiNi_<1-x>Cu_x was slightly increased with the increase of Cu concentration, whereas at a constant Cu concentration it was decreased with the increase of Ni concentration. Dependency of Ms temperature with Ni concentration at x=0.2 was smaller than that at x=0 and 0.1. In the case of a constant Cu concentration, heat of transformation showed a tendency to decrease with the increase of Ni concentration. (3) In x=0.2 a two step increase in the electrical resistivity curve and two exothermic peaks in DSC curve were observed in the cooling process. (4) By means of X-ray diffraction of TiNi_<1-x>Cu_x, it became clear that the parent phase is cubic structure without composition dependence, but the martensite phase is monoclinic structure at x=0 and orthorhombic structure at x=0.2,0.4,0.6.
1981-10-20