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采用Gleeble-1500热模拟试验机对30%SiCP/2024A1复合材料在温度为623~773 K、应变速率为0.01~10 s-1变形条件下热变形流变行为进行了研究。由试验得出变形过程中的真应力真应变曲线,建立热变形本构方程和功率耗散图。结果表明,复合材料的流变应力随温度的升高而降低,随应变速率的增大而升高,说明该复合材料是一个正应变速率敏感的材料。该复合材料热压缩变形时的流变应力行为可采用Zener-Hollomon参数的双曲正弦形式来描述,热变形激活能Q为571.377 kJ/mol。高温高应变速率条件下的功率耗散系数大,该变形区发生了组织转变。
The hot deformation behavior of 30% SiCP / 2024A1 composite at temperatures of 623 ~ 773 K and strain rate of 0.01 ~ 10 s-1 was studied by using Gleeble-1500 thermal simulation machine. The true strain curve of true stress in the process of deformation was obtained by experiment, and the constitutive equation of thermal deformation and power dissipation diagram were established. The results show that the rheological stress decreases with the increase of temperature and increases with the increase of strain rate, indicating that the composite material is a positive strain rate-sensitive material. The rheological stress behavior of the composites during hot compression deformation can be described by the hyperbolic sine form of the Zener-Hollomon parameter. The thermal deformation activation energy Q is 571.377 kJ / mol. High temperature and high strain rate under the conditions of the power dissipation coefficient, the deformation occurred in the transformation zone.