通过搅拌铸造工艺制备出SiCP体积分数分别为2％、5％、10％和15％的4种5 μm SiCP/镁合金(AZ91)复合材料.对5 μm SiCP/AZ91进行了固溶、锻造和热挤压.通过与AZ91对比,研究了SiCP对AZ91基体热变形后显微组织和力学性能的影响规律.结果表明:SiCP/AZ91热变形后的晶粒尺寸取决于SiCP的体积分数.SiCP的体积分数由0％增加到10％时,SiCP/AZ91热变形后的平均晶粒尺寸减小;当SiCP颗粒继续增加到体积分数为15％时,平均晶粒尺寸反而增大.SiCP的加入能显著提高AZ91的屈服强度和弹性模量,并随颗粒体积分数的增加而增大.SiCP对AZ91基体的强化作用主要源于位错强化、细晶强化和载荷传递作用,其中,细晶强化对屈服强度的贡献最大.
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