中文摘要：

目的研究Cu-Al2O3（0.68%）弥散强化铜合金高温圧缩塑性变形特性。方法在Gleeble-1500D热模拟试验机上,在变形温度为550,650,750,850,950℃,应变速率为0.01,0.1,1,5,10 s（-1）,变形量均为50%的条件下,对Cu-Al2O3（0.68%）铜合金进行热压缩变形试验。结果获得了不同热变形条件下的真应力应变曲线,建立了基于双曲正弦本构关系Arrhenius流动应力模型的本构方程,及基于动态材料模型（DMM）的热加工图。结论 Cu-Al2O3（0.68%）弥散强化铜合金高温压缩时,合金的热变形存在应变强化和稳态流变2个基本阶段,主要软化机制为动态再结晶。该合金的最佳变形区域温度为900-950℃,应变速率为0.2-2.8 s（-1）。

英文摘要：

The paper aims to research plastic deformation characteristics of Cu-Al2O3（0.68%） dispersion strengthened cop- per alloy at high temperature. The hot compressive deformation test of Cu-Al2O3（0.68%） copper alloy with 50% of deformation was carried out on a Gleeble-1500D thermal simulator at 550, 650, 750, 850, 950 ℃ of deformation temperature and 0.01, 0.1, 1, 5, 10 s（-1） of strain rate. The true stress-strain curves under different thermal deformation conditions were obtained. The constitutive equations of the Arrhenius flow stress model based on the hyperbolic sine constitutive relation and the thermal machining diagram based on the dynamic material model （DMM） were established. There are two basic stages in thermal deformation of Cu-Al2O3（0.68%） dispersion strengthened copper alloy during high temperature compression： strain hardening and steady state rheology. The main softening mechanism is dynamic recrystallization. The optimum deformation zone temperature of the alloy is 900-950 ℃. Its strain rate is 0.2-2.808 s（-1）.