中文摘要：

摘要在Oleeble-1500D热模拟机上对Zn-Cu-Ti合金进行等温压缩试验，研究了变形温度为150～240℃，应变速率为0．01～10s-1，变形量为50％时锌合金的热变形行为。采用光学显微镜观察热压缩过程中微观组织的变化。结果表明，锌合金在热压缩过程中发生了动态再结晶。锌合金的峰值流变应力随变形温度的升高和变形速率的下降而降低，该合金的流变应力模型可用Arrhenius方程来描述。试验中发现，该合金存在两个热加工安全区，即温度为150～210℃、变形速率为0．67～10S-1区域和温度为215～240℃、变形速率为0．01～0．98S。区域。最佳热加工工艺参数：变形温度为235～240℃，变形速率为0．09～O．1lS～，功率耗散效率为35％。

英文摘要：

The deformation behavior of Zn-Cu-Ti alloy was investigated by compression tests on the Gleeble-1500D thermal simulator machine under the condition of the temperature at 150 ～240 ℃and the strain rate at 0.01 ～10 s-1 as well as the reduction of 50%. Microstructure evolution during com- press was observed by optical microscope. The result show that the dynamic recrystallization occurs dur- ing hot compression deformation. Characteristics of the true stress-true strain curves are different with different deformation conditions. The maximum flow stress is decreased with the increase of deformed temperature and decrease of strain rate. The flow stress model can be described by a constitutive equa- tion in the form of Arrhenius function. Two safety zone in the temperature of 150 ～240 ℃ strain rate at 0.67～10 s-1 and in the temperature of 215～240 ℃, strain rate at 0.01～0.98 s-1 was presented based on processing map under the condition of the experiment. The optimum domain for hot working occurs at 235～240 ℃ and 0.09～0.11 s-1 with the efficiency of power dissipation of 35%.