Bi对Al-40%Mg_2Si复合材料组织和性能的影响  

Influence of Bi on Microstructure and Mechanical Property of Al-40%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,辽宁沈阳110870

出　　处：《铸造》2015年第3期247-250,255,共5页Foundry

摘　　要：为了研究Bi对Al-40%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Mg2Si质量分数为40%的Al-Mg2Si复合材料,并加入不同量的Bi对其细化变质。试验结果显示,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。The microstructure and mechanical properties of cast Al-40%Mg2Si composite modified by Bi have been investigated. The Al-40% Mg2Si composites were made by in-situ process and different amounts of Bi were added to the composites. The results show that the average size of primary phase of Mg2Si decreases firstly, and then increases; but the tensile strength, hardness and elongation increase firstly and then decrease when the mass fraction of Bi increased from 0 to 5%. When the addition of Bi is 3%, the microstructures of Al-40% Mg2Si composites obtain optimum modification and the mechanical properties are the best.

关 键 词：BI Al-40%Mg2Si复合材料 显微组织 力学性能 晶粒尺寸 

分 类 号：TB33[一般工业技术—材料科学与工程]