Study of deformation micromechanism in cold-deformed TiNi based alloys

The microstructural evolution and deformation micromechanism of cold-deformed TiNi based alloys, both in the martensite and parent phase conditions, have been reviewed in the present paper. The emphasis is placed on the modification of the microstructure through atomic migration such as the coalescence and rearrangement of martensite variants and the adjustment and development of internal twinning. The atomic configuration at the pre-existing twin boundaries after deformation have been revealed and the corresponding deformation micro-mechanisms were discussed.