中文摘要：

在变形温度为380～500℃、应变速率为0．01～1s-1的条件下，采用Gleeble-1500热模拟试验机及DeformTM有限元模拟计算对复合材料2A42／2％TiB2热变形加工行为进行研究。结果表明：在应变速率一定的条件下，2A42／TiB2合金的流变应力随变形温度升高而减小；而在变形温度一定的条件下，流变应力随应变速率增大而增大。有限元模拟计算结合热模拟实验证明：热压缩过程中，用于合金组织内部演变能耗值与Zener-Holloman参数的对数值存在可用二次样条曲线拟合的对应关系。微观组织分析表明，高z值区，在2A42／TiB，合金内部形成高位错密度区，温度对位错缠结迁移影响显著，对应的压缩积分能耗差值较大；低Z值区，位错通过迁移合并消失，位错密度大幅降低。对应的压缩积分能耗差值仅为峰值的三分之一。

英文摘要：

Hot deformation behavior of 2A42/2%TiB2 composite was investigated at the temperature range of 380-500℃ and strain rate range of 0.01-1 s-1 via Gleeble-1500 thermal simulation machine and the DeformTM finite element simulation calculation. The results show that the flow stress decreases with increasing deformation temperature and increases with increasing strain rate. The finite element simulations prove that the corresponding relations between internal evolution of energy value and Zener-Holloman parameter can be fitted by quadratic spline curve. The microstrncture analysis shows that, at high Z value region, dislocation with high density form internally and thermal effect on dislocation tangles and migrates is significant. The gap of integral energy consumption between simulation values and experimental values is great. At lower Z-value, dislocations disappear through merging, and dislocation density reduces greatly. Meanwhile, the integral energy consumption is only one third of the peak value.