采用Gleeble-3500热模拟试验机对15%SiCP/8009铝基复合材料在温度为400~550 ℃和应变速率为0.001~1 s-1条件下的热变形流变行为进行研究.结果表明: 流变应力在开始阶段随应变的增加而增大,出现峰值后逐渐趋于平稳;流变应力随温度的升高而降低,随应变速率的增大而升高,呈现出正应变速率敏感性;流变应力行为可以用双曲正弦模型来描述,其热变形激活能为488.3853 kJ/mol,应力指数为7.19022.
The flow stress behavior of 15%SiCP/8009 aluminum matrix composite at deformation temperature of 400-550 ℃ and strain rate of 0.001-1 s-1 was studied by hot compression testing on the Gleeble-3500 thermal-mechanical simulator.The results show that the flow stress increases initially and reaches a plateau after peak stress value with the increase of strain.The peak stress increases with the increase of strain rate and deformation temperature.The flow stress behavior can be described by the hyperbolic sine constitutive equation with the deformation activation energy Q of 488.3853 kJ/mol and the stress index n of 7.19022.
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