Martensitic Transformations in β Phase Alloys

Abstract

CsCl type ordered phases occur frequently in equiatomic alloys. Two broad classes of these phases are recognized (1). The first, with by far the largest number of members, involves transition metals in which one component lies to the left and the other to the right of the chromium group. The equiatomic Ti-Ni alloy is a member of this category, which, for the present purposes, will also be considered to include uranium and its alloys. In the latter systems, however, the high temperature phase generally exhibits a disordered BCC structure. The β phases of the noble metals constitutes the second class. These exhibit the CsCl structure when alloyed with group IIb elements and other ordering arrangements when alloyed with higher valance solutes.