中文摘要：

通过晶体塑性有限元与电子背散射衍射（EBSD）技术相结合的方法,实现TA15钛合金相变点以上高温压缩变形的晶体塑性有限元模拟。采用元胞自动机方法获得了晶粒的初始形貌,通过用户子程序UMAT将基于率相关晶体塑性本构方程嵌入到软件ABAQUS中。模拟结果显示,TA15合金热压缩变形组织呈明显的形变不均匀特征,模型中晶粒内部应力应变分布不均匀。不同晶粒滑移系的开动不同,即使在同一晶粒内部,也存在滑移系开动不同步的情况。采用电子背散射衍射（EBSD）技术对TA15钛合金的热压缩变形组织的变形不均匀特征进行了验证。

英文摘要：

A crystal plasticity finite element model （CPFEM ） and the technology of EBSD have been developed to investigate the activation of the slip systems during compression of T A15 polycrystal at the temperature of 1 050℃ and the strain rate 0.01 s^-1 . The constitutive equations based on rate‐dependent crystal plasticity were embedded in the software ABAQUS .The results show that , the activation of the slip system are quite different .Both strain and stress show nonuniformity in and out the grains due to the nonuniformity of the activation of the slip systems .The inhomogeneous characteristics of TA15 alloy hot deformation are ob‐served with electron backscatter diffraction （EBSD） .