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为了研究铋(Bi)对Al-30%Mg2Si复合材料显微组织和力学性能的影响,利用原位内生工艺制备了Al-30%Mg2Si复合材料,并加入不同量的Bi对其细化变质.利用扫描电镜进行显微组织观察,并利用布氏硬度计和液压式万能试验机进行力学性能测试.试验结果显示,稀土Bi的质量分数由0%增加至5%时,初生相Mg2Si的平均晶粒尺寸先减小后变大,而抗拉强度、硬度和伸长率则先提高后减小;当Bi加入量约为3%时,初生相Mg2Si显微组织细化效果最为明显,综合力学性能最好.
In order to study the effect of bismuth (Bi) on the microstructure and mechanical properties of Al-30% Mg2Si composites, Al-30% Mg2Si composites were prepared by in-situ endogenous technology and different amounts of Bi were added to refine and degrade The microstructure was observed by scanning electron microscopy and the mechanical properties were tested by Brinell hardness tester and hydraulic universal testing machine.The results showed that when the mass fraction of rare earth Bi was increased from 0% to 5%, the average primary phase Mg2Si The grain size first decreases and then increases, while the tensile strength, hardness and elongation increase first and then decrease. When the addition amount of Bi is about 3%, the microstructure refinement of the primary phase Mg2Si is the most obvious, and the comprehensive mechanics The best performance.