1. Point defects and mechanical behavior of titanium alloys and intermetallic compounds
- Author
-
Jianmin Lu, Svetlana E. Kulkova, Rui Yang, Qing-Miao Hu, Dmitry I. Bazhanov, Yu-Lin Hao, and Dongsheng Xu
- Subjects
History ,Materials science ,Diffusion ,Metallurgy ,Intermetallic ,Titanium alloy ,chemistry.chemical_element ,Crystallographic defect ,Computer Science Applications ,Education ,Solid solution strengthening ,Creep ,chemistry ,Solid solution ,Titanium - Abstract
First principles calculations were carried out to investigate the energetics of point defects, including solute atoms, vacancies, and antisite defects, in titanium solid solution and intermetallics. Their influence on the mechanical behavior of titanium alloys and intermetallic compounds were discussed. The self consistent procedure proposed by the authors was applied to TiAl intermetallic compounds. The ordering parameter was redefined to include the contribution of vacancies to the disordering of intermetallic compounds, so that the new approach can be applied to both strongly and weakly ordered compounds. Concentrations of point defects of various kinds can be estimated for intermetallics of different composition at different temperature. The solid solution strengthening of alloying elements through short range ordering was studied for titanium alloys and the solid solution hardening rate was estimated for various alloying elements. The solute-vacancy interaction in titanium alloys was calculated and its influence on the diffusion and creep behavior was discussed. These calculations provided some useful information for the selection of alloying elements in designing new titanium alloys.
- Published
- 2006