(南京航空航天大学 机电学院，南京 210001)
摘 要: 为了研究TA12钛合金高温流变行为，构建能准确描述其高温流变行为的本构模型，对TA12钛合金进行了温度范围为700~850 ℃，应变速率为0.001~0.1 s-1的高温拉伸试验。结果表明：在所研究的变形条件下，流变应力随应变的增加而逐渐增大，达到峰值应力后又逐渐减小，直至材料发生断裂，并在850 ℃、0.001 s-1的变形条件下出现了稳态流动应力。综合考虑应变硬化效应、应变速率硬化效应和热软化效应的影响，提出一种修正的JC本构模型，可准确地描述TA12钛合金的高温流变行为。
关键字: TA12钛合金；高温流变行为；本构模型
（College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210001, China）
Abstract:In order to study the flow behavior of TA12 titanium alloy at high temperature and set up the constitutive model that accurately describes its flow behavior at high temperature, the tensile tests at the temperatures of 700-850 ℃ and at strain rates of 0.001-0.1 s-1 were carried out. The results show that, under the deformation conditions, the flow stress increases with the increase of strain, and then decreases gradually after reaching the peak stress until the material breaks and the steady flow stress occurs at 850 ℃ and 0.001 s-1. Considering the effects of strain hardening, strain rate hardening and thermal softening, a modified JC constitutive model was proposed. It can accurately describe the flow behavior of TA12 titanium alloy at high temperature.
Key words: TA12 titanium alloy; high temperature flow behavior; constitutive model
