SHAPE MEMORY EFFECT IN TiNi: ONE ASPECT OF STRESS-ASSISTED MARTENSITIC TRANSFORMATION.

Abstract

The effects of stress on the transformation, both forward and reverse, is fully developed, with particular reference to those conditions under which shape memory behavior can be induced. Experimental evidence for some of the proposed mechanisms is presented. The discussion of phenomena other than the shape memory is limited to the extent necessary to understand why apparently trivial changes in the experimental conditions can cause major differences in the observed shape memory behavior. The mechanical property anomalies which represent the effects of stress on the transformation are discussed in some detail, and experimental results on both TiNi and on some other materials exhibiting shape memory effect are considered. The conditions under which optimum shape memory behavior may be expected are suggested.