TC21合金的高温变形行为

High temperature deformation behavior of TC21 alloy

采用等温压缩试验法,研究了TC21钛合金在温度范围为900～1100℃和应变速率为0.01～50s-1范围内的高温变形行为,建立了合金热变形的本构方程。结果表明,TC21合金在较高温度条件下,变形机制为动态回复,在较低温度下,变形机制为晶界滑移。其转折温度在相变点附近,在此温度上下,变形激活能不同,两相区变形激活能为330.57kJ/mol,β区变形激活能为176.49kJ/mol。

By thermal simulation experiment, high temperature deformation characteristics of TC21 titanium alloy are investigated within temperature range of 900-1100°C and strain rate range of 0.01-50 s-1. The constitutive equations are established. The test results show that the deformation mechanisms of the alloy exhibit dynamic recovery feature within high temperature region and grain boundary slip behaviors in low temperature case, where β phase transus temperature is the mechanism conversion point. Deformation activation energy values are 330.57 kJ/mol in (α+β) region, and 176.49 kJ/mol in β region respectively.