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SiCP/AZ91复合材料的显微组织、力学性能及强化机制

, PP. 388-395

Keywords: 金属基复合材料,颗粒增强,热变形,显微组织,力学性能,强化机制

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Abstract:

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5μmSiCP/镁合金(AZ91)复合材料。对5μmSiCP/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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