1976 Volume 41 Issue 1 Pages 79-84
Cu50−xNixZn50 β phase alloys undergo a martensitic transformation from the CsCl-type ordered cubic (B2 structure) to the AuCuI-type tetragonal (L10 structure). The martensite L10 phase appears at room temperature when Ni composition x becomes larger than 32.5 at.%, i.e. when electron atom ratio (e⁄a) becomes smaller than 1.175. In order to clarify the origin of B2–L10 transition, composition and temperature dependence of the elastic constants in Cu50−xNixZn50 alloys were measured. The elastic constant C′=(C11−C12)⁄2 decreases with increase in x and dC′⁄dT is positive (i.e. lattice softening) in the cubic phase, which are suggested to have an important role on the martensitic transformation in these alloys.
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