Microstructure and mechanical properties of friction stir welding of AZ31B magnesium alloy added with cerium
来源期刊：JOURNAL OF RARE EARTHS2010年第2期
论文作者：于思荣 陈显君 黄志求 刘耀辉
文章页码：316 - 320
摘 要：The AZ31B magnesium alloy sheet added with 0.5 wt.% Ce was welded with friction stir welding（FSW）.The microstructures and mechanical properties of the welded joint were investigated.The results showed that the microstructures in the weld nugget zone were uniform and with small equiaxed grains.The grains in the heat-affected zone and the thermo-mechanical affected zone were coarser than those in the base metal zone and the weld nugget zone.The ultimate tensile strength of AZ31B magnesium alloy added with 0.5 wt.% Ce was 270.41±4.48 MPa,and its elongation to fracture was（17.71±0.60）%.The ultimate tensile strength of FSW joint was 237.97±2.53 MPa,and its elongation to fracture was 6.63±0.60%.The fracture locations of FSW joint were in the heat-affected zone.The ductile fracture was the main fracture mode.The ulti-mate tensile strength of the sample along the direction of the weld was 270.02±1.45 MPa,and its elongation to fracture was（17.08±0.39）%.The microhardness in the weld nugget zone was slightly lower than that in the base metal.The microhardness in the thermo-mechanical affected zone and heat affected zone was lower than that in the weld nugget zone.The microhardness increased from the surface to the bottom of the weld.
于思荣1，陈显君1，黄志求1,2，刘耀辉1
1. Key Laboratory of Automobile Materials (Jilin University),Ministry of Education,and College of Materials Science and Engineering,Jilin University2. College of Materials Science and Engineering,Jiamusi University
摘 要：The AZ31B magnesium alloy sheet added with 0.5 wt.% Ce was welded with friction stir welding（FSW）.The microstructures and mechanical properties of the welded joint were investigated.The results showed that the microstructures in the weld nugget zone were uniform and with small equiaxed grains.The grains in the heat-affected zone and the thermo-mechanical affected zone were coarser than those in the base metal zone and the weld nugget zone.The ultimate tensile strength of AZ31B magnesium alloy added with 0.5 wt.% Ce was 270.41±4.48 MPa,and its elongation to fracture was（17.71±0.60）%.The ultimate tensile strength of FSW joint was 237.97±2.53 MPa,and its elongation to fracture was 6.63±0.60%.The fracture locations of FSW joint were in the heat-affected zone.The ductile fracture was the main fracture mode.The ulti-mate tensile strength of the sample along the direction of the weld was 270.02±1.45 MPa,and its elongation to fracture was（17.08±0.39）%.The microhardness in the weld nugget zone was slightly lower than that in the base metal.The microhardness in the thermo-mechanical affected zone and heat affected zone was lower than that in the weld nugget zone.The microhardness increased from the surface to the bottom of the weld.
关键词：
