Deformation Characterization,Twinning Behavior and Mechanical Properties of Dissimilar Friction-Stir-Welded AM60/AZ31 Alloys Joint During the Three-Point Bending  

作　　者：Junlei Zhang Han Liu Xiang Chen Qin Zou Guangsheng Huang Bin Jiang Aitao Tang Fusheng Pan 

机构地区：[1]College of Materials Science and Engineering,Kunming University of Science and Technology,Kunming,650093,China [2]State Key Laboratory of Mechanical Transmission,College of Materials Science and Engineering,Chongqing University,Chongqing,400044,China [3]National Engineering Research Center for Mg Alloys,Chongqing University,Chongqing,400044,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2022年第5期727-744,共18页金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.52071035,U1764253)。

摘　　要：The AZ31 and AM60 alloys were used for dissimilar friction stir welding(FSW)in this study.The microstructure characteristics of the joint and its three-point bending performance were investigated.The electron backscattered diffraction results showed that the grains in the nugget zone(NZ)were more uniform and refined to a certain extent after FSW,but the grain size of AM60 in the NZ was larger than that of AZ31.The texture was strong locally in the NZ and presented a symmetric distribution characteristic from the advancing side to the retreating side.There were special texture features in the joint,resulting in the occurrence of severe strain localization during the bending process compared with the base materials,which can be well explained by the calculated Schmid factor in terms of the assumed stress state for bending.The bending tests revealed that the joint presented good bending properties compared with AZ31 BM.The bending fracture morphologies suggested that the fracture tended to the NZ interface on the AZ31 side,which was mainly due to the higher SF for basal slip and dislocation concentration degree in the region,and the relatively lower bending strength of AZ31 metal.

关 键 词：Friction stir welding(FSW) Dissimilar joint Microstructure evolution Bending properties DEFORMATION 

分 类 号：TG453.9[金属学及工艺—焊接]