Bi对Al-30% Mg_2Si复合材料组织和性能的影响  

Influence of Bi on microstructure and properties of Al-30% Mg_2Si composite

作　　者：任玉艳[1] 刘桐宇[1] 李英民[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《沈阳工业大学学报》2015年第2期159-164,共6页Journal of Shenyang University of Technology

基　　金：辽宁省创新团队基金资助项目(005168)

摘　　要：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 influence of Bi on the microstructure and mechanical properties of Al-30% Mg2Si composite,the Al-30% Mg2Si composite was prepared with in-situ process,and different amount of Bi element was added to refine the composite. The microstructure was observed with scanning electron microscope( SEM),and the mechanical properties were tested with the Brinell hardness tester and hydraulic universal tester. The results showthat when the mass fraction of Bi increases from 0% to 5%,the average grain size of primary phase M g2 Si firstly decreases and then increases. but the tensile strength,hardness and elongation firstly increase and then decrease. When the addition of Bi is about 3%,the refinement effect of primary phase Mg2Si is most obvious,and the comprehensive mechanical properties are the best.

关 键 词：原位内生 Al-30%Mg2Si复合材料 显微组织 力学性能 枝晶间距 晶粒尺寸 抗拉强度 硬度 

分 类 号：TB33[一般工业技术—材料科学与工程]