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利用常应力拉伸蠕变实验法对体积分数为30%的硅酸铝短纤维增强AZ91D镁基复合材料及其基体合金AZ91D在不同温度和应力下进行蠕变测试。结果表明:2种材料的真应力指数均为3,真蠕变激活能均等于144.63kJ/mol;复合材料的蠕变是由基体的蠕变控制,以位错黏滞性滑移控制为主,晶界滑移控制为辅。由实验数据获得的蠕变本构模型的经验公式能较好地描述复合材料的蠕变变形规律。
The creep test of AZ91D magnesium matrix composites and its matrix alloy AZ91D with 30% volume fraction of aluminum silicate short fibers and its base alloy AZ91D was carried out at constant temperature and stress. The results show that the true stress exponent of the two materials are all 3, and the true creep activation energy is equal to 144.63 kJ / mol. The creep of the composites is dominated by the creep of the matrix and dominated by the dislocation viscosity slip control , Grain boundary slip control supplemented. The empirical formula of the creep constitutive model obtained from the experimental data can well describe the creep deformation law of the composite material.