在Thermecmastor-Z试验机上进行热压缩实验,在应变速率0.01～10 s-1、变形温度900～1150℃条件下对TC27钛合金的变形行为进行研究并建立其本构方程.结果表明,该材料为温度和应变速率敏感材料.在变形初始阶段,流变应力随真应变的增加迅速增大,达到应力峰值后随真应变的增加缓慢降低,最后趋于相对稳定的状态.流变应力随温度的升高而降低,随应变速率的增加而增加.热压缩实验过程流变应力随应变速率和变形温度的变化规律可以用材料的本构方程来表征,变形激活能为Q=300 kJ/mol.
The deformation behavior of TC27 titanium alloy at the strain rate of 0.01～10 sq and the temperature of 900～1150℃ was investigated and the constitutive equation during the hot compression was established in the machine of Thermecmastor-Z.The results indicate that the material is sensitive to temperature and strain rate.At the beginning of deformation,the flow stress increases quickly with the augment of true strain and decreases slowly when stress reaches to the maximum value;finally,it becomes stable.Besides,the flow stress decreases with the increase of temperature and increases with the increase of strain rate.The change of flow stress with strain rate and temperature can be described by the constitutive equation during hot compression processing.The active energy of deformation is 300 kJ/mol
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