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。
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.
出处
《热加工工艺》
CSCD
北大核心
2010年第12期66-68,共3页
Hot Working Technology
基金
华东交通大学科研基金(01306016
07JD06)
江西省教育厅青年科研基金(09497)
江西省青年科研基金(2009GQC0014)
国家自然科学基金(50765005)
关键词
镁基复合材料
本构方程
热变形
流变应力
magnesium matrix composites
constitutive equation
hot deformation
flow stress
