Mn对AlSiMgMn型铝合金组织与性能的影响  

Effect of Mn Element on Microstructure and Properties of AlSiMgMn Aluminum Alloy

作　　者：陈科 张福豹[1] 倪红军[1] 金宇阳 朱昱[1] 黄明宇[1] CHEN Ke;ZHANG Fubao;NI Hongjun;JIN Yuyang;ZHU Yu;HUANG Mingyu(School of Mechanical Engineering,Nantong University,Nantong 226019,China)

机构地区：[1]南通大学机械工程学院,江苏南通226019

出　　处：《有色金属工程》2020年第4期37-43,共7页Nonferrous Metals Engineering

基　　金：南通市基础科学研究项目(JC2018112);江苏高校优势学科建设工程资助项目(苏政办发[2018]87号);江苏省科技成果转化项目(BA2017026);江苏省产学研合作项目(BY2019137)。

摘　　要：采用光学金相显微镜(OM)、扫描电镜电子显微镜(SEM)观察表征、电导率测试、力学拉伸实验以及电化学腐蚀实验等方法研究了Mn对AlSiMgMn型铝合金组织与性能的影响。结果表明,添加适量的Mn能提高合金的力学性能,当Mn质量分数从0.2%增加到0.65%,合金的平均晶粒粒径由104μm下降到44μm,电导率由21.8 Ms/m下降到19.7 Ms/m,抗拉强度和延伸率呈先上升后下降的趋势,当Mn质量分数为0.35%时,力学性能最好,合金的抗拉强度最高,为207.5 MPa,延伸率为5.5%;Mn含量的增加使合金的耐腐蚀性下降。The effects of Mn on the microstructure and properties of AlSiMgMn aluminum alloy were investigated by means of metallography,Scanning Electron Microscopy(SEM),conductivity test,mechanical tensile test and electrochemical corrosion test.The research showed that adding proper amounts of Mn can improve the mechanical properties of the alloy.When the mass fraction of Mn increased from 0.2%to 0.65%,the average grain size of the alloy decreased from 104μm to 44μm,the conductivity decreased from 21.8 Ms/m to 19.7 Ms/m,the tensile strength and elongation increased firstly and then decreased.When the mass fraction of Mn was 0.35%,the mechanical properties were the best.The tensile strength of the alloy was the highest,it was 207.5 MPa,and the elongation was 5.5%.The increase in the Mn content caused the corrosion resistance of the alloy to decrease.

关 键 词：AlSiMgMn合金 MN 力学性能 电化学腐蚀 

分 类 号：TG146.2[一般工业技术—材料科学与工程]