SiCP /AZ61复合材料的高温压缩变形本构方程
Research on Constitutive Equation of SiCP /AZ61 Composite During Hot Deformation
赵龙志1,2, 陈炳辉2, 赵明娟2, 闫 洪1
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作者单位：1. 南昌大学 机电学院, 江西 南昌 330013; 2. 华东交通大学 载运工具与装备省部共建教育部重点实验室, 江西 南昌 330013)
中文关键字：镁基复合材料； 本构方程； 热变形； 流变应力
英文关键字：magnesium matrix composites; constitutive equation; hot deformation; flow stress
中文摘要：采用热压缩试验研究了SiC颗粒增强镁基复合材料在应变速率为0.1～10 s-1、变形温度为803～843 K时的热成形性能，并在实验数据分析的基础上根据真应力-真应变曲线，计算出复合材料的本构方程及变形激活能Q。结果表明，复合材料在高温下的流变应力较低，峰值应力与变形温度、应变速率之间的关系在低应力区符合指数关系。该复合材料的激活能随着应变速率的增大而增大。
英文摘要：The hot compressive behavior at 803～843 K and strain rate (0.1～10 s-1) of SiCP /AZ61 composites was investigated by Gleeble-1500 thermal simulation testing machine and the constitutive parameters were identified through the experiments. The apparent activation energy(Q) of the selected composite was determined according to true stress-true strain curve and a new constitutive model for composite thixotropic forming was put forward. The results show that, the flow stress of SiCP/AZ61 composite is low, the relationship between peak stress and temperature or strain rate is exponential relationship. The Q value of the composite increases with the strain rate increasing.