(1. 北京工业大学 材料科学与工程学院，北京100124；2. 航空材料研究院，北京100095)
摘 要: 在880~950 ℃和不同应变速率0.01~10 s−1条件下，将TC21钛合金高温压缩变形至50%。研究高温变形参量对流动应力及微观组织的影响规律，建立了TC21合金的本构方程。结果表明：流变应力随变形温度的降低及应变速率的增大而升高，变形温度与应变速率对TC21钛合金显微组织的影响显著，应变速率越低，组织球化现象越明显。高温变形过程中，TC21钛合金的流变应力与Zener-Hollomon参数的指数形式呈线性关系。
关键字: TC21钛合金；热变形；微观组织；Zener-Hollomon参数
microstructure and properties of TC21 titanium alloy
（1. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;
2. Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract:The hot deformation behavior of TC21 titanium alloy was investigated at 880−950 ℃, in a strain rate range of 0.01−10 s−1 and with the total deformation of 50%. The influence of hot deformation parameters on the flow stress and microstructure was investigated, and the constitutive equation was presented. The results indicate that the flow stress rises with increasing strain rate and decreasing temperature. The microstructure evolvement is largely affected by deformation temperature and strain rate. The globalizing process is more obvious with decreasing strain rate. The flow stress of TC21 titanium alloy at high temperature can be represented by a Zener-Hollomon parameter with the exponent-type equation.
Key words: TC21 titanium alloy; hot deformation; microstructure; Zener-Hollomon parameter
