Mn对A356铝合金铁相形貌组织和力学性能的影响  

Influence of Manganese on Microstructure Morphology of Iron Phase and Mechanical Properties of A356 Aluminum Alloy

作　　者：刘涛[1,2] 苏光[2] 

机构地区：[1]重庆大学国家镁合金材料工程技术研究中心,重庆400030 [2]河南机电高等专科学校材料工程系,河南新乡453000

出　　处：《铸造》2014年第7期647-650,共4页Foundry

基　　金：重庆市科技攻关项目(CSTC2008AA4029;CSTC2009AC3062)

摘　　要：通过加入元素Mn并配合热处理工艺来控制A356铝合金富铁相的形态。研究表明：合金经过热处理后，加入Mn能够使大部分针状铁相β-Al5FeSi转变成粒径较为均一的颗粒状或树枝状铁相α-Al（Fe，Mn）Si；预先热处理与铸态相比力学性能更好，改变Mn的加入量能够控制块状铁相的粒径大小；经过Mn与热处理共同作用的A356铝合金的抗拉强度提高30-40MPa，伸长率提高4％～6％。The control of the shape of iron-rich phase was explored by adding manganese in melt ofA356 alloy and heat treatment. The results show that the needle-like iron phase β-A15FeSi can mostly be transformed into lumpish or dendritic by adding manganese after 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. After the Mn addition and heat treatment, the tensile strength and elongation of A356 alloy are improved by 30-40 MPa and 4 %-6 %, respectively.

关 键 词：A356合金 铁相 热处理 组织形貌 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]