在温度为360~450℃、应变率为0.001~1 s-1的变形条件下,采用 Gleeble-1500D热模拟机对固相回收 SiCp/ZK60镁基复合材料的高温压缩变形行为进行研究。结果表明：固相回收 SiCp/ZK60的流变应力随变形温度的升高而降低,随应变率的升高而升高,且随应变的增加,流动应力很快达到峰值,然后逐渐趋于稳定。固相回收SiCp/ZK60热压缩变形应力指数为3.348,变形激活能为64.97 kJ/mol,其高温压缩流变应力模型为?ε=4.69×104[sinh(0.051σ)]3.348 exp(-64790/(RT))；本试验条件下,固相回收 SiCp/ZK60的流变应力模型可以用 Zener-Hol-lomon参数的双曲线函数形式进行描述。
The study on hot compressive deformation behavior of solid phase recycling SiCp/ZK60 composites showed that material flow stress depends on the deformation temperature and deformation rate at high temperature compression deformation.When the deformation occurred at a certain temperature,flow stress increased with the in-crease of strain rate;When the deformation occurred at a certain strain rate,flow stress decreased with the increase of temperature.Under the experimental conditions,stress index of SiCp/ZK60 by solid phase recycling was 3.348,the activation of deformation was 64.97 kJ/mol.The model for high temperature compression was?ε=4.69×104 [sinh (0.051σ)]3.348 exp(-64790/(RT)).In the strain rate of 0.001-1 s-1 and deformation temperature of 360-450 ℃, the flow stress model of compression deformation of SiCp/ZK60 composites by solid phase recycling can be described by Zener-Hollomon parameter form of hyperbolic function,and the model provide more scientific test theory basis for further magnesium matrix composite hot extrusion process parameters.
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