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在Gleeble-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0.01~10 s-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0.67~10 s-1区域和温度为215~240℃、变形速率为0.01~0.98 s-1区域。最佳热加工工艺参数:变形温度为235~240℃,变形速率为0.09~0.11 s-1,功率耗散效率为35%。
The isothermal compression tests of Zn-Cu-Ti alloy on a Gleeble-1500D thermal simulator were carried out. The deformation of the Zn-Cu-Ti alloy at 150-240 ℃ and the strain rate of 0.01-10 s-1 were studied. behavior. The optical microscopy was used to observe the microstructure changes during hot compression. The results show that the dynamic recrystallization of zinc alloy occurs during hot compression. The peak flow stress of zinc alloy decreases with the increase of deformation temperature and the decrease of deformation rate. The flow stress model of the alloy can be described by Arrhenius equation. It is found that there are two hot working safe zones in the alloy, that is, the zone has a temperature of 150-210 ℃, a deformation rate of 0.67-10 s -1 and a temperature of 215-240 ℃ and a deformation rate of 0.01-0.98 s -1 . The best thermal processing parameters: deformation temperature of 235 ~ 240 ℃, deformation rate of 0.09 ~ 0.11 s-1, the power dissipation efficiency of 35%.