Microstructural softening induced adiabatic shear banding in Ti-23Nb-0.7Ta-2Zr-O gum metal

查看全文 作　　者：Silu [1]Liu;[2]Y.Z.Guo;[3]Z.L.Pan;[4]X.Z.Liao;[5]E.J.Lavernia;[1,6]Y.T.Zhu;[3]Q,M,Wei;Yonghao [1]Zhao

机构地区：[1]Nano and Heterogeneous Materials Center,School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;[2]School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China;[3]Department of Mechanical Engineering,University of North Carolina at Charlotte,NC 28223-0001,USA;[4]School of Aerospace,Mechanical and Mechatronic Engineering,The University of Sydney,NSW 2006,Australia;[5]Department of Materials Science and Engineering,University of Californi1,Irvine,CA 92697,USA;[6]Department of Materials Science and Engineering,North Carolina State University,NC 27695,USA

出　　处：《Journal of Materials Science & Technology》索引2020年第54卷第19期,共9页

基　　金：the National Key R&D Program of China(No.2017YFA0204403);the National Natural Science Foundation of China(Nos.51971112 and 51225102);the Fundamental Research for the Central Universities(No.30919011405);the financial support by the National Natural Science Foundation of China(Nos.11672354 and 11922211);the“111 Project”(No.BP0719007)。 摘　　要：Ti-23Nb-0.7Ta-2Zr-O gum metal(GM)is an attractive candidate material for applications that require superior mechanical properties.In our earlier investigation of the GM[1],geometrical softening and the generation of adiabatic shear bands(ASBs)were proposed as primary reasons for the documented anisotropic impact response.In the present study,electron backscattered diffraction(EBSD)analysis reveals two different deformed microstructures,i.e.,deformed ultrafine grains(UFGs)and dynamically recrystallized UFGs,formed in the ASBs of GM samples processed by extrusion equal channel angular pressing(ECAP),respectively.Additional calculation of temperature rise during dynamic compression suggests that the above microstructure differences in the ASBs was originated from their different maximum ASB temperatures(608 K for extruded GM and 1159 K for ECAP-processed GM).Moreover,our calculation on the temperature at the onset of ASBs indicates that microstructural softening is the primary cause for the development of ASBs in both extruded GM(321 K)and ECAP-processed GM(331 K). 关键词：Gum metal Split hopkinson bar Adiabatic shear band MICROSTRUCTURES

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Microstructural softening induced adiabatic shear banding in Ti-23Nb-0.7Ta-2Zr-O gum metal

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