采用熔体直接反应法成功制备了Mg2Sip/Al复合材料,研究了Mg2Si颗粒含量及530℃固溶6h＋173℃时效5h热处理对复合材料组织和性能的影响,利用X射线衍射仪、扫描电镜等分析了复合材料的物相和显微组织,并测试了其力学性能。结果表明,随着Mg2Si颗粒含量的增加,在一定范围内,铸态复合材料基体的晶粒尺寸随之变小;热处理后Mg2Si颗粒名义含量4%（质量分数）的复合材料析出的二次相颗粒较名义含量5%（质量分数）的复合材料更多,二次相颗粒平均尺寸均约为4μm,且颗粒名义含量4%（质量分数）的复合材料热处理后抗拉强度和伸长率分别达到280MPa和9%,较热处理前分别提高了24.44%和63.64%
The Mg2Sip/Al composites were fabricated with melt direct reaction method.The effect of Mg2Si particle content and heat treatment by solution treatment at 530℃ for 6h followed by artificial ageing at 173℃ for 5h on microstructure and performance of the composites were investigated,the phase contents and the microstructure of the composites were analyzed by XRD,SEM and EDS,and the mechanical properties were then tested.The results indicate that:in a certain range,the grain size of the matrix of the as-cast composites are getting smaller with increasing particle content;the composite with a nominal Mg2Si particle content of 4wt% after heat treatment precipitates more second phase particles than the composite with a nominal Mg2Si particle content of 5wt%,and the average size of second phase particles in both of them are about 4μm.After heat treatment,the tensile strength and the elongation of the composite with a nominal Mg2Si content particle of 4wt% reach 280MPa and 9% which are 24.44% and 63.64% higher than those before heat treatment,respectively.
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