Sn含量对车用粉末注射成形Al-Mg合金组织和力学性能的影响  

Effect of Sn content on microstructure and mechanical properties of Al-Mg alloy for automotive powder injection molding

作　　者：门殿勇[1] 李明刚 MEN Dianyong;LI Minggang(College of Intelligent Manufacturing and Automobile,Neijiang Vocational and Technical College,Neijiang 641000,China;College of mechanical engineering,Sichuan university,Chengdu 610065,China)

机构地区：[1]内江职业技术学院智能制造与汽车学院,四川内江641000 [2]四川大学机械工程学院,四川成都610065

出　　处：《粉末冶金工业》2021年第3期50-54,共5页Powder Metallurgy Industry

基　　金：省级高技能人才培训基地建设项目资助(NZ2018C07);四川省教育科研课题(SCJG20A295)。

摘　　要：采用粉末注射成形制备了车轻量化用Al-Mg合金,并研究了Sn含量及固溶处理对其微观组织和力学性能的影响。结果表明:在600~620℃烧结的Al-Mg合金致密度高于98%。随着Sn含量增加,Al-Mg合金致密度单调增加,Sn含量大于1%后增加不明显,此时晶界区域形成了更多的白色颗粒物,主要为Sn的聚集。Sn元素在固溶处理过程可以发挥较大的力学强化效果,Al-Mg合金进行固溶处理可以明显提升拉伸强度。固溶态合金拉伸强度随Sn加入量的增大先增大再减小,当加入1%的Sn时,拉伸强度最大。固溶组织内形成了孔隙结构,出现斑点现象,随着Sn含量的增加斑点数量减少。当Sn加入量为1%时,可以获得更高力学强度,但Sn比例过高会引起铝合金力学强度的减小。The Al-Mg alloy for automotive lightweight were prepared by the powder injection molding. The effects of Sn content and solution treatment on microstructure and mechanical properties of Al-Mg alloy were studied. The results show that the density of Al-Mg alloy sintered at 600~620 ℃ is higher than 98%. With the increasing of Sn content, the density of Al-Mg alloy increases monotonically. When the Sn content is greater than 1%, the increase is not obvious. At this time, more white particles are formed in the grain boundary area, mainly Sn accumulation. Sn element can play a greater mechanical strengthening effect in the solution treatment process, the solution treatment can significantly improve the tensile strength of Al-Mg alloy. The tensile strength of solid solution alloy increases first and then decreases with the increasing of Sn amount. When 1% Sn is added, the tensile strength reaches the maximum. The pore structure are formed in the solid solution tissues, and the spots phenomenon are appeared, and the number of spots decreased with the increase of Sn content. When the amount of Sn is less than 1%,higher mechanical strength can be obtained, but too much Sn will cause the decreasing of mechanical strength of aluminum alloy.

关 键 词：Al-Mg铝合金 注射成形 Sn元素 微观组织 力学性能 

分 类 号：U465.2[一般工业技术—材料科学与工程] TG146.21[机械工程—车辆工程]