Morphological changes associated with the /7-phase and martensitic transformations in ti-ni single crystals

Abstract

The martensitic transformation and the R-phase transition were observed successively upon cooling and heating both in solution-treated and age-treated Ti-Ni specimens, and they were correlated with the electrical resistance vs. temperature curves for both cases. Specific self-accommodating morphologies were observed both for the R-phase and martensite variants in an age-treated specimen, while no specific self-accommodating morphology was observed for martensite variants in a solution-treated specimen, the reason for the difference being discussed. The interaction between the ñ-phase and martensite variants was also observed to affect the morphology of the ñ-phase variants upon heating. curves for both cases. Specific self-accommodating morphologies were observed both for the R-phaseand martensitevariants in an age-treated specimen, while no specific self-accommodating morphologywasobserved for martensite variants in a solution-treated specimen, the reason for the difference being discussed. The interaction between the R-phaseand martensite variants wasalso observed to affect the morphologyof the R-phasevaTiants upon heating. © 1989, The Iron and Steel Institute of Japan. All rights reserved.