Coupled study on in-situ synchrotron high-energy X-ray diffraction and in-situ EBSD on the interfacial stress gradient in layered metals  

作　　者：Kesong Miao Yiping Xia Rengeng Li Emad Maawad Weimin Gan Xuewen Li Hao Wu Chenglu Liu Qing Liu Guohua Fan 

机构地区：[1]Key Laboratory for Light-weight Materials,Nanjing Tech University,Nanjing 211816,China [2]Institute of Materials Physics,Helmholtz-Zentrum Hereon,Geesthacht 21502,Germany

出　　处：《Journal of Materials Science & Technology》2024年第32期184-196,共13页材料科学技术(英文版)

基　　金：supported by the National Key Re-search&Development Plan(No.2022YFE0110600);the National Natural Science Foundation of China(Nos.52201122,92263201,52171117,and 52371113);the Jiangsu Funding Program for Excel-lent Postdoctoral Talent(No.2022ZB366);the China Postdoc-toral Science Foundation Funded Project(No.2023M731636).

摘　　要：As one of the heterostructures,the layered structure has attracted extensive research interest as it achieves superior properties to individual components.The layer interface is considered a critical fac-tor in determining the mechanical properties of layered metals,where heterogeneity across the interface results in the strengthening of the soft layer and forming an interfacial stress gradient in the hard layer.However,there is still limited research associated with the formation of interfacial stress gradients in the hard layer,as stress measurement at high spatial resolution remains technically challenging.In the present study,we experimentally quantified the formation of interfacial stress gradients in the Ti layer of Ti/Al layered metal upon tension using in-situ high-energy X-ray diffraction(XRD).The analysis cou-pling in-situ high-energy XRD and in-situ electron back-scattered diffraction(EBSD)suggested that the interfacial stress gradient in the Ti layer rapidly rose as the Al layer was insufficient to accommodate the deformation of Ti.During the later deformation stage,collective effects of dislocation motion and geometrically necessary dislocation(GND)accumulation in the Al layer determined the evolution of in-terfacial stress gradients.The maximum interfacial stress gradient is below 0.4 MPa/μm in Ti layers,with a constant range width of 35μm independent of the macroscopic strain.The present study therefore opens a new window to local stress modification using incompatible component deformation,which is instructive for the design and fabrication of high-performance layered metals.

关 键 词：Layered metals Interfacial stress gradient High-energy x-ray diffraction Mechanical property Plastic deformation 

分 类 号：TG1[金属学及工艺—金属学]