Zhang Dongdong, Chen Yuyong, Zhang Guoqing, Liu Na, Kong Fantao, Tian Jing, Sun Jianfei
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
College Vanadium and Titanium, Panzhihua University, Panzhihua 617000, China.
Materials (Basel). 2020 Feb 17;13(4):896. doi: 10.3390/ma13040896.
The hot deformation behavior and microstructure evolution of powder metallurgy (PM) Ti43Al9V0.3Y alloy with fine equiaxed γ and B2 grains were investigated using uniaxial hot compression. Its stress exponent and activation energy were 2.78 and 295.86 kJ/mol, respectively. The efficiency of power dissipation and instability parameters were evaluated, and processing maps at 50% and 80% strains were developed. It is demonstrated that the microstructure evolution was dependent on the temperature, strain, and strain rate. Both temperature and strain increases led to a decrease in the γ phase. Moreover, dynamic recrystallization (DRX) and grain boundary slip both played important roles in deformation. Reasonable parameters for secondary hot working included temperatures above 1100 °C but below 1200 °C with a strain rate of less than 1 s at 80% strain. Suitable hot working parameters at 50% strain were 1150-1200 °C/≤1 s and 1000-1200 °C/≤0.05 s.
采用单轴热压缩方法研究了具有细小等轴γ相和B2相晶粒的粉末冶金（PM）Ti43Al9V0.3Y合金的热变形行为和微观组织演变。其应力指数和激活能分别为2.78和295.86 kJ/mol。评估了功率耗散效率和失稳参数，并绘制了50%和80%应变下的加工图。结果表明，微观组织演变取决于温度、应变和应变速率。温度和应变的增加均导致γ相减少。此外，动态再结晶（DRX）和晶界滑移在变形过程中均起重要作用。二次热加工的合理参数包括在80%应变下温度高于1100℃但低于1200℃且应变速率小于1 s⁻¹。50%应变下合适的热加工参数为1150 - 1200℃/≤1 s⁻¹和1000 - 1200℃/≤0.05 s⁻¹。
