|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Thermal Stability of ω-phase in Pure Ti Formed by High-pressure Torsion Process
||Nozomu Adachi, Yoshikazu Todaka, Minoru Umemoto
|On-Site Speaker (Planned)
Group IV metals transform to a high-pressure phase called ω-phase with a simple hexagonal structure under extremely high pressure. High-pressure Torsion (HPT) process is the only method to obtain a bulk single ω-phase sample in pure Ti at ambient condition. In this study, the thermal stability of ω-phase formed by the HPT process was investigated through calorimetric and electrical resistivity measurements. The ω-to-α reverse transformation occurred at 430 K under a heating rate of 30 K/min. The activation energy for reverse transformation temperature was estimated from the heating rate dependence of transformation temperature (Kissinger plot), and was 158 kJ/mol which is close value to the activation energy for self diffusion of Ti. The impurity effects on the thermal stability of ω-phase will be also discussed in the presentation.
||Planned: A print-only volume