Influence of Heat Treatment on the Mechanical Behaviour of a NiTi Alloy

Abstract

Measurements of the effect of heat treatment following cold work on the yield and shape memory behaviour in a NiTi alloy are reported. Tensile behaviour is found to depend on test temperature and initial structure as well as annealing temperature. Minimum values of stress required for stress induced martensite, martensite reorientation and parent phase yield were found to be associated with the as-recrystallized structure. Measurements of reversion and permanent strains were found to depend on applied stress. © 1989, The Iron and Steel Institute of Japan. All rights reserved.