Tensile and cyclic deformation response of friction-stir-welded dissimilar aluminum alloy joints:Strain localization effect  

作　　者：P.L.Niu W.Y.Li D.L.Chen 

机构地区：[1]State Key Laboratory of Solidification Processing,Shaanxi Key Laboratory of Friction Welding Technologies,Northwestern Polytechnical University,Xi'an,710072.China [2]Department of Mechanical and Industrial Engineering,Ryerson University,350 Victoria Street,Toronto,Ontario,M5B2K3,Canada

出　　处：《Journal of Materials Science & Technology》2021年第14期91-100,共10页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.51574196);the Natural Sciences and Engineering Research Council of Canada(NSERC)in the form of an international research collaboration;the financial support by Premier’s Research Excellence Award(PREA);NSERC-Discovery Accelerator Supplement(DAS)Award;Canada Foundation for Innovation(CFI);Ryerson Research Chair(RRC)program。

摘　　要：Cyclic deformation behavior of friction-stir-welded dissimilar AA2024-T351 to AA7075-T65 aluminum alloy joints was evaluated via stepwise tests at different strain rates,along with transmission electron microscopy examinations to characterize the precipitates required to assess internal stresses.Electron backscatter diffraction was employed to observe the inhomogeneous microstructures of the FSWed joints.Strain localization appeared in the heat affected zone(HAZ)of AA2024 side.After cyclic deformation of 500 cycles at a total strain amplitude of 0.5%,the strength of the dissimilar joints resumed basically to that of AA2024 base material.And the AA2024 HAZ was obviously hardened,which should be attributed to the introduced dislocations during cyclic deformation process.Cyclic hardening capacity of the joints increased with decreasing strain rate.

关 键 词：Friction stir welding Dissimilar aluminum alloys Strain localization Cyclic hardening Slip irreversibility 

分 类 号：TG453.9[金属学及工艺—焊接]