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.
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