Ce对Al-15%Mg_2Si复合材料组织和性能的影响

为了研究Ce元素对Al-15%Mg_2Si复合材料微观组织和力学性能的影响,利用原位内生工艺制备了Al-15%Mg_2Si复合材料,并加入不同质量分数的Ce元素对复合材料进行细化变质.利用扫描电子显微镜进行微观组织观察,利用布氏硬度计和液压万能试验机进行力学性能测试.结果表明,添加Ce元素后Mg_2Si相以块状和粒状形态存在于Al基体中,随着Ce元素质量分数的增加,初生Mg_2Si相得到细化,其力学性能呈现先增大后减小的趋势.当Ce元素的质量分数为0.6%时,初生Mg_2Si相的细化效果最好,其力学性能最佳.

Influence of Ce on microstructures and properties of Al-15%Mg2Si composite

In order to study the effect of Ce element on the microstructures and mechanical properties of Al-15%Mg₂Si composite, the Al-15%Mg₂Si composite was prepared with in-situ formation technology, and the Ce element with different mass fractions was added to refine and modify the composite. In addition, the microstructures were observed with scanning electron microscope(SEM), and the mechanical properties were tested with the Brinell hardness and hydraulic universal testers. The results show that after adding Ce element, the Mg₂Si phase with the massive and granular morphologies exists in the Al matrix. With increasing the mass fraction of Ce element, the primary Mg₂Si phase gets refined, and the mechanical properties of the composite firstly increase and then decrease. When the mass fraction of Ce element is 0.6%, the refinement effect of primary Mg₂Si phase is best and the mechanical properties of the composite are optimal.