Dynamic recrystallization kinetics in 伪 phase of as-cast Ti-6Al-2Zr-1Mo-1V alloy during compression at different temperatures and strain rates

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• 作者：Guo-zheng Quan ; Dong-sen Wu ; Gui-chang Luo ; Yu-feng Xia ; Jie Zhou ; Qing Liu ; Lin Gao
• 关键词：Dynamic recrystallization ; Strain hardening rate ; Critical strain ; Volume fraction ; Titanium alloy
• 刊名：Materials Science and Engineering: A
• 出版年：1 January, 2014
• 年：2014
• 卷：589
• 期：Complete
• 页码：23-33
• 全文大小：1928 K

文摘

In order to evaluate the dynamic recrystallization (DRX) behavior of as-cast Ti-6Al-2Zr-1Mo-1V alloy, a series of compressions with a height reduction of 60% were performed in a temperature range of 1073-1323 K (0.55-0.68T_m) and a strain rate range of 0.01-10 s^鈭? on a Gleeble1500 thermo-mechanical simulator. By the regression analysis for conventional hyperbolic sine equation, the activation energy of DRX was determined as Q=933.3233 kJ mol^鈭?, and a dimensionless parameter controlling the stored energy were determined as . According to the strain hardening rate curves (d蟽/d蔚 versus 蟽), three characteristic parameters including the critical strain for DRX initiation (蔚_c), the strain for peak stress (蔚_p), and the strain for maximum softening rate (蔚^{鈦?/sup>) were identified. A modified Avrami type equation was introduced to characterize the evolution of DRX volume fraction in 伪-phase temperatures under 0.59T_m, in which 蔚_c, 蔚鈦?/sup> and m were described as and m=4.133402 respectively. The evolution of DRX volume was described as the following: for a fixed strain rate, the strain required for the same amount of DRX volume fraction increases with decreasing deformation temperature, in contrast, for a fixed temperature, it increases with increasing strain rate. Finally, the theoretical predictions were validated by the microstructure graphs.}