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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。
The hot forming properties of SiC particle reinforced magnesium matrix composites were investigated by means of hot compression test at strain rates of 0.1-10 s-1 and deformation temperatures of 803-843 K. Based on the experimental data, Strain curve to calculate the constitutive equation of the composites and deformation activation energy Q. The results show that the rheological stress of composites at low temperature is low, and the relationship between peak stress, deformation temperature and strain rate is exponential in the low stress region. The activation energy of the composites increases with the increase of strain rate.