SiCp/AM60B 镁基复合材料的高温压缩变形行为

Hot compression deformation behaviors of SiCp/AM60B magnesium matrix composite at elevated temperature

摘要:

利用Gleeble-1500热模拟试验机,在温度为360~450℃、应变速率为0.001~1 s-1变形条件下,对 SiCp/AM60B镁基复合材料的热压缩变形行为进行了研究.结果表明,SiCp/AM60B镁基复合材料流变应力随变形温度的升高而降低,随应变速率的升高而升高,且随着应变的增加,流变应力很快达到峰值,然后逐渐降低并趋于稳定.为评价 SiCp/AM60B镁基复合材料在热加工变形过程中的流变应力,结合Arrhenius方程且引入Zener-Hollomon参数,对流变应力做出相应的修正,根据修正后的流变应力再做出相应的修正,根据修正后的应力值创建SiCp/AM60B镁基复合材料流变应力高温变形本构方程模型.

Abstract:

The hot compression of SiC/AM60B magnesium matrix composite were performed on Gleeble-1500 at deformation temperatures of 360-450 ℃ and strain rates of 0.001-1 s-1 .The results show that the relationship between stress and strain is affected obviously by the strain rate and deformation temperature. The flow stress increases with increasing strain rate at constant temperature and decreases with increasing deformation temperature at constant strain rate.In order to evaluate the thermo-mechanical process,a flow stress model is constituted based on Arrhenius equation and temperature-compensated strain rate factor, the Zener-Hollomon parameter,and modified further by considering the effect of strain.