Effect of abc Pressing at 573 K on the Microstructure and Martensite Transformation Temperatures in Ti49.8Ni50.2 (at%)

This paper presents experimental data on the microstructure and martensite transformation temperatures of Ti49.8Ni50.2 (at%) after abc pressing (multi-axial forging) to different true strains e from 1.84 9.55 at 573 K. The show that increasing strain results in grain–subgrain refinement scales a time. With = K, average size measured approximately 130 nm. Decreasing temperature 723 K caused decrease all temperatures, change lattice parameters, R phase formation, angular shifts diffraction peaks their broadening. largest was provided by 1.84. Increasing resulted much smaller effect, suggesting alloy obtained high density structural defects even Two possible mechanisms are discussed.