采用试验和有限元方法研究了热处理制度对金属基短纤维复合材料(MMC)蠕变性能的影响,同时考虑了2种不同热处理制度和1种铸造状态.试验结果表明,MMC的蠕变响应与热处理制度有关.在相同蠕变应力时,铸态试样有最小的最小蠕变应变率和最长的蠕变寿命,而热处理制度2(试样在550℃保温24 h后随炉冷却)具有明显的最大的最小蠕变应变率和最短蠕变寿命,热处理制度1(试样在550℃保温24 h后水冷)具有中等的最小蠕变应变率和中等的蠕变寿命.用单胞模型结合有限元方法模拟分析了热处理的影响,结果表明,热处理制度的影响可以归于热处理引起的残余应力和残余应变以及它们的历史,具体可以归于基体的蠕变耗散能、纤维轴向力和纤维-基体界面力.同时考虑了单胞模型的参数对上述分析结果的影响.
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