Ti-5523钛合金热变形流变行为的研究

Study on Hot Deformation Behavior of Ti-5523 Titanium Alloy

采用恒应变速率高温压缩模拟实验,对Ti-5523钛合金在应变速率为0.001～5.0s-1,变形温度为600～900℃条件下的流变应力行为进行了研究,计算了变形激活能及相应的应力指数,建立了合金的应力-应变关系方程。结果表明:在恒温条件下,合金的流变应力随应变速率的增大而增大;在恒应变速率条件下,合金的流变应力随温度的升高而降低;变形激活能和应力指数分别为Q=317.81kJ·mol-1和n=4·43;可用包含Arrhenius项的Zener-Hollomon参数描述Ti-5523钛合金高温塑性变形时的流变行为。

The flow stress behaviors of Ti-5523 titanium alloy during hot deformation under the conditions of strain rate in the range of 0.001 - 5.0 s^-1 and temperature at the range of 600 - 900 ℃ were investigated by hot-compression testing at a constant strain rate. The hot deformation activation energy and corresponding stress exponent were calculated. From the calculation the equation of strain rate and flow stress was deduced. The results showed that the flow stress became higher with the increase of strain rate at a constant temperature, and lower with increase of deformation temperature at a constant strain rate. The hot deformation activation energy and the corresponding stress exponent were determined to be 317.81 kJ·mol^-1 and 4.43 respectively. The flow stress of Ti-5523 titanium alloy during deformation at high temperature could be expressed by Zener-Hollomon parameter including the Arrhenius tenn.