|About this Abstract
||Materials Science & Technology 2019
||Powder Metallurgy of Light, Reactive and Other Non-ferrous Metals
||P2-69: Modeling the Critical Dynamic Recrystallization of a PM Ti-22Al-25Nb Alloy during Hot Compression Deformation
||Yu Sun, Lianxi Hu, Yuan Yuan
|On-Site Speaker (Planned)
The deformation behavior of a powder metallurgy Ti-22Al-25Nb alloy was studied by the hot compression tests at the temperature range of 995-1075 ℃ and strain rate range of 0.001-1 s-1. Applying conventional Arrhenius equations, the activation energies for dynamic recrystallization were calculated to be 410.172 KJ/mol. The critical DRX model was constructed by the critical conditions dynamics theory Poliak and Jonas proposed with Zener-Hollomon parameter. Results showed that the ratio of the critical strain and the strain of peak stress was constant at 0.67 under different deformation conditions. In addition, εp was expressed via exponential form of Z. According to the effects of deformation temperatures and strain rates on the Z parameter, it was revealed that the values of εc and σc decreased with temperatures increasing and strain rates reducing, further indicating that lower Z parameter could promote the occurrence of DRX behavior for the studied alloy.
||Definite: At-meeting proceedings