マルテンサイト変態の種々相―Au-Cd合金を例に

抄録

The Au-Cd alloys near equi-atomic composition are quite fascinating ones, in which the shape memory effect, and rubber-like behavior were first found, and the phenomenological crystallographic theory was successfully applied at the beginning. However, the B2-ξ₂' (trigonal) martensitic transformation in the alloys has been least understood until recently. Besides, the alloys are prototype of all martensitic alloys, in which all unique phenomena appear in an ideal manner. The present paper reviews recent developments on the alloys with the authors' experiences, which cover crystal structure of ξ₂' martensite, crystallography of the martensitic transformation, precursor phenomena and the mechanism of the rubber-like behavior etc.