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中文摘要：
在Gleeble-1500D热模拟试验机上对Cu-Cr-Zr-Ag合金进行高温等温压缩试验,当热压缩应变速率为0.001~10 s-1、热变形温度为650~950℃时,同时对合金高温热压缩的热加工图以及变形机制进行研究。结果表明:流变应力随变形温度的升高而减小,随应变速率的提高而增大;热变形过程中的稳态流变应力可用双曲正弦本构关系式来描述,其激活能为Q=343.23 k J/mol,同时利用逐步回归的方法建立了该合金的流变应力方程。根据动态材料模型计算并分析了合金的热加工图,并且获得了试验参数范围内热变形过程的最佳工艺参数:温度为750~800℃、应变速率范围为0.01~0.1 s-1,并利用热加工图分析了该合金不同区域的高温变性特征以及组织变化。
英文摘要：
The high temperature deformation mechanism and hot processing map of Cu-Cr-Zr-Ag alloy were investigated by compressive tests on Gleeble?1500D thermal-mechanical simulating tester in the temperatures range of 650?950℃, strain rate range of 0.001?10 s?1. The results show that the flow stress decreases with the increase of temperature, while increases with the increase of strain rate. The flow behavior is described by the hyperbolic sine constitutive equation and the activation energy of the alloy is Q=343.23 kJ/mol. The constitutive equation is obtained by stepwise regression analysis. The processing maps were established based on the dynamic material model. The optimum processing parameters of hot deformation in the range of this experiment can also be attained by the plans,in which the hot temperature is 750?800 ℃ and the strain rate is 0.01?0.1 s?1. The hot deformation characteristics and microstructures were also analyzed by the processing maps.
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