The anelastic origin of mechanical cycling induced rejuvenation in the metallic glass

作     者：Langting Zhang Yunjiang Wang Yong Yang Jichao Qiao 

作者机构：School of MechanicsCivilEngineering and ArchitectureNorthwestern Polytechnical UniversityXi'an 70072China State Key Laboratory of Nonlinear MechanicsInstitute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering ScienceUniversity of Chinese Academy of SciencesBeijing 100049China Department of Mechanical EngineeringCollege of EngineeringCity University of Hong KongHong Kong 999077China Department of Materials Science and EngineeringCollege of EngineeringCity University of Hong KongHong Kong 999077China Innovation CenterNPU-ChongqingChongqing 401135China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2023年第66卷第8期

页      面：93-100页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.51971178,and 52271153) the Natural Science Basic Research Plan for Distinguished Young Scholars in Shaanxi Province(Grant No.2021JC-12) the Fundamental Research Funds for the Central Universities (Grant No.D5000220034) the Natural Science Foundation of Chongqing (Grant No.cstc2020jcyj-jq X0001) supported by the National Natural Science Foundation of China (Grant No.12072344) the Youth Innovation Promotion Association of the Chinese Academy of Sciences support from the Research Grant Council (RGC) the Hong Kong government through the General Research Fund (GRF)(Grant Nos.City U11200719,and City U11213118) 

主　　题：metallic glass mechanical cycling rejuvenation anelastic strain structural heterogeneity 

摘      要：Mechanical cycling is one of the effective methods to rejuvenate metallic glasses(MGs)and improve their mechanical *** anelastic origin of the rejuvenation by mechanical cycling in a La_(30)Ce_(30)Ni_(10)Al_(20)Co_(10) MG was investigated via differential scanning calorimetry(DSC)and dynamic mechanical analysis(DMA).We demonstrate that mechanical cycling promotes the activation of flow defects with short relaxation times,leading to anelastic strains and therefore considerable energy storage,which manifests itself as larger relaxation enthalpy on the DSC curves of ***,the MGs release the excess relaxation enthalpy caused by anelastic strain with time,thus suppressing atomic mobility and elevating β relaxation activation *** strategy of mechanical cycling at small strains,as demonstrated in the current work,can expand the energy states of MGs over a wide range of relaxation enthalpies.