对MB15合金和(B4Cp+SiCw)/MB15复合材料在170℃的时效特性进行了比较研究.DSC结果表明,复合材料中时效相的析出过程比基体合金提前,且析出量增加,而析出相的溶解过程推迟.TEM观察发现,复合材料中析出物仍为Laves MgZn2′相,且在SiCw/Mg与B4Cp/Mg两种界面上和界面反应物MgB2上优先析出.维氏硬度测试表明,复合材料有明显的时效加速,达到峰时效只需6 h,而基体合金需40 h,但复合材料与基体合金的时效强化效果相近.
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