添加0.2%Sn对Al-Si-Mg合金组织及力学性能的影响  

Effect of 0.2%Sn addition on microstructure and mechanical properties of Al-Si-Mg alloy

作　　者：尹昕 尹登峰[1,2,3] 王凯先 李继林 池国明[3] 曹汉权 Yin Xin;Yin Dengfeng;Wang Kaixian;Li Jilin;Chi Guoming;Cao Hanquan(School of Materials Science and Engineering,Central South University,Changsha Hunan 410083,China;Guangdong Institute of Materials and Processing,Guangzhou Guangdong 510651,China;Ruyuan Dongyangguang Fine Foil Company Limited,Shaoguan Guangdong 512721,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]广东省工业技术研究院,广东广州510651 [3]乳源东阳光精箔有限公司,广东韶关512721

出　　处：《金属热处理》2020年第4期16-21,共6页Heat Treatment of Metals

基　　金：广东省应用型科技研发专项(2015B090926007)。

摘　　要：采用光学显微镜(OM)、扫描电镜(SEM)、能谱分析(EDS)以及拉伸测试等方法,研究了0.2%的Sn元素对Al-Si-Mg系铝合金铸态以及T6热处理状态下的组织形貌演变以及力学性能的影响。结果表明:添加0.2%的Sn元素能够细化共晶硅相形貌,并使初生α-Al晶粒更加均匀,减少并改善了有害杂质相形貌及分布,在T6(535℃固溶6 h+160℃时效5 h)状态下的规定塑性延伸强度和抗拉强度分别达到了262.3 MPa和305.1 MPa,伸长率为4.32%,比未添加Sn时的基础合金分别提高了9.8%和12.4%,伸长率提高了22.6%。Effect of 0. 2% Sn addition on the microstructures and mechanical properties of Al-Si-Mg alloy with as-cast and T6 heat treated state was studied by optical microscopy( OM),scanning electron microscopy( SEM),energy spectrum analysis( EDS) and tensile testing.The results show that the addition of 0. 2% Sn refines the morphology of the eutectic silicon phase and makes the primary α-aluminum grains more uniform,which reduces and improves the morphology and distribution of harmful impurities. At T6 state( solution treatment at 535 ℃ for6 h + aging at 160 ℃ for 5 h),the proof strength,plastic extension and tensile strength of the alloy reach 262. 3 MPa and 305. 1 MPa respectively,is increased by 9. 8% and 12. 4% higher than that of the base alloy without Sn addition,and the elongation is 4. 32%,which is increased by 22. 6%.

关 键 词：Sn元素 Al-Si-Mg系铝合金 铸态组织 T6热处理 力学性能 

分 类 号：TG166.3[金属学及工艺—热处理]