采用搅拌铸造法制备了体积分数为6％的SiC./6061复合材料.通过高温蠕变试验、金相观察(OM)、断口形貌扫描(SEM)及能谱分析(EDS),研究其不同温度下的蠕变性能并分析蠕变断裂机制.结果表明:温度对SiCp/6061铝基复合材料的高温蠕变性能有很显著的影响,温度越高,蠕变性能越差;在250℃、80 MPa的应力下,SiCp/6061铝基复合材料的蠕变寿命约为14 h,而6061铝合金经280 min即发生断裂.由此可以认为,SiCp/6061铝基复合材料比基体合金具有更好的抗高温蠕变能力;复合材料的蠕变断裂机制是首先沿SiCp/Al界面产生塑性撕裂的裂纹源,微裂纹沿晶界扩展,最终发生断裂.
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