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Adiabatic shear instability in a titanium alloy:Extreme deformation-induced phase transformation,nanotwinning,and grain refinement

查看全文 作　　者：[1]X.R.Guan;[2]Q.Chen;[1,3]S.J.Qu;[4]G.J.Cao;[5]H.Wang;[1,3]A.H.Feng;[6]D.L.Chen 高影响力作者 机构地区：[1]School of Materials Science and Engineering,Tongji University,Shanghai 201804,China;[2]Southwest Technology and Engineering Research Institute,Chongqing 400039,China;[3]Shanghai Key Laboratory of D&A for Metal-Functional Materials,School of Materials Science&Engineering,Tongji University,Shanghai 201804,China;[4]Key Laboratory for Light-weight Materials,Nanjing Tech University,Nanjing 210009,China;[5]Interdisciplinary Center for Additive Manufacturing,School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 2000093,China;[6]Department of Mechanical and Industrial Engineering,Toronto Metropolitan University(formerly Ryerson University),Toronto,ON M5B 2K3,Canada高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2023年第19期,共10页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (NSFC) (Nos.51871168,52271012);the Natural Sciences and Engineering Research Council of Canada (NSERC)in the form of international research collaboration.Q.C.,A.H.F.,and S.J.Q.are grateful to the Southwest Institute of Technology and Engineering Cooperation Fund (No.HDHDW5902020102);H.W.acknowledges the financial support of the National Key Laboratory Foundation of Science and Technology on Materials under Shock and Impact (No.6142902220301). 摘　　要：Increasingly harsh service conditions place higher requirements for the high strain-rate performance of titanium alloys.Adiabatic shear band(ASB),a phenomenon prone to dynamic loading,is often accom-panied by catastrophic damage.Yet,it is unclear how the internal nanostructures are related to shear instability.Here we report detailed microstructural evolution in the ASB of a titanium alloy via in-depth focused ion beam(FIB),transmission Kikuchi diffraction(TKD),and high-resolution transmission electron microscope(HRTEM)analyses,with the deformation instability phenomenon discussed from the energy perspective.The ASB interior undergoes multifaceted changes,namely deformation-induced beta-to-alpha transformation and deformation-induced martensitic transformation to form substantially refined and heterogeneous structures.Meanwhile,two types of extremely fine twins are identified to occur within both nano-sized martensite and alpha phase.The critical plastic work representing the onset of adiabatic shear instability and dynamic equilibrium is observed to be constant for a specific structure in the same deformation mode.The energy analysis could be extended to other materials subjected to high strain-rate dynamic deformation. 关 键 词：Adiabatic shear instability Deformation-induced phase transformation Deformation-induced nanotwinning Dynamic recovery Energy analysis
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