不同粉末冶金方法制备的Al3Ti / Mg复合材料的性能研究
Study on Mechanical Properties of Al3Ti /Mg Composite Fabricated by Different Powder Metallurgy Methods
杨冠男, 刘 英, 李 卫
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作者单位：暨南大学 材料系, 广东 广州 510632
中文关键字：Al3Ti/Mg复合材料； 原位合成； 粉末冶金； 力学性能
英文关键字：Al3Ti /Mg composite; in-situ reaction synthesis; powder metallurgy; mechanical properties
中文摘要：采用原位合成和外加法两种粉末冶金方法制备了质量分数为10%、20%、30%、40%的Al3Ti颗粒增强镁基复合材料， 并对复合材料进行了XRD衍射分析、 微观组织分析以及硬度、压缩强度和磨损性能的分析。结果表明，原位合成法制备的复合材料中Al3Ti颗粒尺寸较细，为1～5μm； 外加法制备的复合材料中Al3Ti颗粒尺寸为5～15μm； Al3Ti颗粒均匀分散在镁基体中，可大幅度提高材料的强度和耐磨性能；原位合成法比外加法具有更好的强化效果， 随着Al3Ti含量的增加，复合材料的硬度和压缩强度显著增加；原位合成法、外加法制备的复合材料中Al3Ti含量分别为20%、30%时耐磨性能最佳。
英文摘要：Al3Ti particles reinforced magnesium matrix composite with 10wt%, 20wt%, 30wt%, 40wt% Al3Ti was respectively prepared by different powder metallurgy route through in-situ synthesis method and mechanical mixing. The microstructure was investigated by SEM, the component of the composite was characterized by XRD, and the hardness, compressive strength and wear resistance were tested and compared between the composite prepared by the two different methods. The results show that the small Al3Ti particles with 1～5 μm are acquired by in-situ synthesis method. The Al3Ti particles size with 5～15μm in the composite is prepared by mechanical mixing. The particles uniformly disperse in the magnesium matrix, the strength and wear resistance of the composite is highly enhanced. The hardness and compressive strength can be increased by improving the content of Al3Ti, and in-situ synthesis method leads to higher performance than mechanical mixing method. The best wearability is acquired when the content of Al3Ti is 20wt% for the composite prepared by in-situ synthesis method and 30% for the composite prepared by mechanical mixing method.