Investigation on Microstructure and Mechanical Property of the A7N01 Aluminum Alloy Welding Joint

摘要：

　　The A7N01 aluminum alloy was welded by MIG welding in test,and the microstructure and mechanical property of joint were investigated.The results of experimentation show that the feature of the A7N01 aluminum alloy MIG welding joint is perfect with a gentle transition.The microstructure of fusion metal in A7N01 joint is as-cast grain.The microstructure of fusion zone consists of the fine columnar grains.It is rolling structure in the parent metal.In HAZ,the rolling structure is disappearing.The μ1′ (MgZn2) strengthening phases were precipitated in the grain boundary of the A7N01 aluminum alloy.The size ofη′ strengthening phase is about 5-10 nm.There is no precipitation phase in welding metal of A7N01 joint.The fine η′ transitional phases of the primeval parent metal are turned to the coarse η (MgZn2) stable phases of the HAZ.The size of η strengthening phase is about 50 nm.The tensile strength and the percentage elongation after fracture of A7N0l welding joint is below the parent metal.

关键词： Aluminum alloy welding joint Microstructure Mechanical property

作者: Shanglei Yang Bin Luo Renyuan Lv Lichun Meng Qinglin Lin

作者单位: Shanghai University of Engineering Science, Shanghai 201620, China CSR, Sifang Locomotive and Rolling Stock Co., Ltd.Qingdao 266111, China

会议类型: 国际会议

会议名称: the 2012 International Conference on Frontiers of Advanced Materials and Engineering Technology (2012年先进材料与工程技术国际会议(FAMET 2012))

会议地点: 厦门

会议语种:英文

页码: 2091-2094

在线出版日期: 2012-01-04（万方平台首次上网日期，不代表论文的发表时间）