Mn含量对挤压铸造Al-5.0Cu-0.5Fe合金显微组织和力学性能的影响(英文)  

Effects of Mn content on microstructures and mechanical properties of Al-5.0Cu-0.5Fe alloys prepared by squeeze casting

作　　者：张卫文[1] 林波[1] 程佩[1] 张大童[1] 李元元[1] 

机构地区：[1]华南理工大学国家金属材料近净成形工程技术研究中心,广州510640

出　　处：《中国有色金属学会会刊：英文版》2013年第6期1525-1531,共7页Transactions of Nonferrous Metals Society of China

基　　金：Project(U1034001)supported by the Natural Science Foundation of Guangdong Province,China;Project(2011BAE21B00)supported by the National Key Technology R & D Program during the12th Five-year Plan of China;Projects(2009A090100026,2008A010300003)supported by Key Projects of Science and Technology of Guangdong Province,China

摘　　要：采用拉伸性能测试、光学显微镜、扫描电镜和定量金相测试手段研究Mn含量对不同压力下挤压铸造Al-5.0Cu-0.5Fe合金显微组织和力学性能的影响。结果表明:当挤压压力为0MPa,Mn/Fe质量比达到1.6时才能将针状β-Fe相(Al7Cu2Fe)完全转变成汉字状α-Fe相(Al15(FeMn)3(CuSi)2)。而对于挤压铸造,当挤压压力为75MPa时,在Mn/Fe质量比为0.8时就可以将β-Fe相完全转变成α-Fe相。挤压铸造合金中需要的Mn含量较低,即Mn/Fe质量比较小,这主要是由于在挤压压力下富Fe相的细化以及相比例的减少。然而,加入过量的Mn将导致合金力学性能的下降,这是因为过量的Mn将导致α-Fe相的增多及这些多余的硬脆相导致的孔洞增多。The effects of Mn content on the microstructures and mechanical properties of squeeze cast Al-5.0Cu-0.5Fe alloys at different applied pressures were examined by tensile test, optical microscopy, scanning electron microscopy and image analysis.The results show that the needle-like β-Fe phase (Al7Cu2Fe) is completely converted to the Chinese script α-Fe phase (Al15(FeMn)3(CuSi)2) when the applied pressure is 0 MPa and the Mn/Fe mass ratio reaches 1.6.As to squeeze casting, the Mn/Fe mass ratio of 0.8 is demanded for the complete conversion of β-Fe phase to α-Fe phase at the applied pressure of 75 MPa.The lower Mn content, i.e., the less Mn/Fe mass ratio, for squeeze cast alloy is due to the small size and less content of the Fe-rich phases.Excessive amount of Mn, however, deteriorates the mechanical properties because of the increase in the total amount of α-Fe and the porosity that associates with the excessive brittle phases.

关 键 词：铝合金 MN 富铁相 挤压铸造 力学性能 

分 类 号：TG249.2[金属学及工艺—铸造]