锰结合预先热处理对铝硅合金中富铁相组织和力学性能的影响  

Influence of manganese and pre-heat treatment on microstructure and mechanical properties of Al-Si alloy

作　　者：张磊[1] 焦万丽[1] 尉海军[1] 姚广春[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110004

出　　处：《中国有色金属学报》2005年第3期368-373,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展规划项目(G199906490 4)

摘　　要：探索了通过加入金属Mn并结合熔体热处理工艺来控制铝硅合金中富铁相的形态.结果表明:熔体经过预先热处理后,加入Mn可以使绝大多数针状铁相转变成块状铁相,且粒径均一;预先热处理可以减少Mn的加入量而取得较好的效果,适宜的加入量为x(Mn)/x(Fe)=0.5～1.1(摩尔比),并可以通过控制Mn的加入量来控制块状富铁相杂质的粒径大小;经过联合处理的含铁铝硅合金的抗拉强度提高40～80 MPa,伸长率提高6%～7%.The control of the shape of iron-rich phase were realized by adding manganese in melt of Al-Si alloy and pre-heat treatment. The results show that the needle-like iron phase can mostly be transformed into lumpish by adding manganese after pre-heat treatment, and the grain sizes are symmetrical. The better effect can be gained by adding less manganese after heat-treatment, and the grain size can be controlled by controlling the amount of manganese basically. The suitable amount of Mn is x(Mn)/x(Fe)=0.5~1.1(molar ratio). After the combined treatment, the tensile strength and elongation of Al-Si alloy are improved by 40~80MPa and 6%~7%, respectively.

关 键 词：富铁相 预先热处理 杂质 粒径 力学性能 

分 类 号：TF777[冶金工程—钢铁冶金]