Sn,Bi对易切削Al-Mg-Si合金组织与性能的影响  

Effects of Sn and Bi on Microstructure and Properties of Lead-free and Free-cutting Al-Mg-Si Alloy

作　　者：姜锋[1] 瞿纪平[1] 陈宜钊[1] 徐燕萍[1] 韩靓[1] 

机构地区：[1]中南大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2011年第7期612-615,共4页Special Casting & Nonferrous Alloys

摘　　要：采用力学性能测试、X射线衍射物相分析、SEM背散射扫描和能谱分析、金相试验技术,研究了时效工艺对固溶-冷拉处理过程中,用Sn和Bi微合金化对无Pb易切削Al-Mg-Si合金棒材显微组织结构特征和力学性能的影响。结果表明,其最佳的时效热处理工艺为170℃×8h。单独添加Sn的合金的物相组成除了Al基体,还有低熔点Mg2Sn和AlMnSi相,而联合添加Sn,Bi的合金组织由Al基体,低熔点Mg3Bi2与少量Sn和Bi单质以及AlMnSi相组成。Effects of aging treatment on microstructure and mechanical properties of lead-free and free-cutting Al-Mg-Si alloy contained minor Sn and Bi were investigated during solid-solution and cold drawing process by tensile testing, XRD （X-ray diffraction）, SEM （scanning electron microscope） and EDS. The results show that, the optimized aging treatment is treated at 170℃ for 8 h. The alloy with Sn addition only is composed of Al matrix and Mg2Sn as well as AlMnSi phase, while the alloy with Sn and Bi addition is composed of Al, Mg3Bi2 and AlMnSi phase as well as minor Sn and Bi phase.

关 键 词：易切削 AL-MG-SI合金 微观组织 

分 类 号：TG115[金属学及工艺—物理冶金]