三层复合板铝/镁合金/铝FSW接头的微观组织与抗拉强度  

Microstructure and Tensile Strength of Aluminum/Magnesium Alloy/Aluminum FSW Joint of Three-Layer Composites

作　　者：赵菲[1] 王康 马立峰[1] Zhao Fei;Wang Kang;Ma Lifeng(School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024

出　　处：《稀有金属材料与工程》2022年第3期1047-1054,共8页Rare Metal Materials and Engineering

基　　金：山西省重点研发计划(高新技术领域)(201903D121054);NSFC-山西煤基低碳联合基金(重点支持项目)(U1910213);山西省高等学校科技创新项目(2019L0621)。

摘　　要：在不同焊接速度下进行了三层复合板Al/AZ31/Al搅拌摩擦焊接(FSW)工艺试验,并观察分析其接头成形显微组织和拉伸性能。结果显示:在实验优化的工艺参数下,焊缝接头成形较好,其内部呈层状分布且未发现缺陷;焊核区(NZ)晶粒细化明显,大角晶界(HAGBs)和再结晶晶粒占比达80%;在焊缝前进侧带状组织区(BS)和镁、铝界面处存在金属间化合物(IMC),主要为Al_(3)Mg_(2)和Al_(12)Mg_(17);随焊速的增加,焊接接头的抗拉强度先增大后减小,在v=100 mm/min时焊核区铝层晶粒平均尺寸为1.75μm,接头抗拉强度达到最大87.3 MPa,是母材的50.8%。The friction stir welding(FSW)process tests of three-layer composite plate Al/AZ31/Al at different welding speeds were carried out,and the joint forming,microstructure and tensile properties were observed and analyzed.The results show that under the optimized process parameters,the welded joint is well formed,and its internal distribution is layered,and no defects are found.The grain refinement in nugget zone(NZ)is obvious,and the large angle grain boundaries(HAGBs)and recrystallized gr ains account for 80%.There is intermetallic compound(IMC)in the banded structure area(BS)on the forward side of the weld and the interface between magn esium and aluminum,which is mainly composed of Al3Mg2 and Al12Mg17.With the increase of welding speed,the tensile strength of welded joint first increases and then decreases.When v=100 mm/min,the average grain size of the aluminum layer in the weld nugget area is 1.75µm,and the tensile strength of the welded joint reaches the maximum 87.3 MPa,which is 50.8%of the base metal.

关 键 词：三层复合板Al/AZ31/Al 搅拌摩擦焊接接头 微观组织 抗拉强度 

分 类 号：TG406[金属学及工艺—焊接]