Aging and rejuvenation during high-temperature deformation in a metallic glass

作     者：Langting Zhang Yunjiang Wang Yong Yang Jichao Qiao 

作者机构：School of MechanicsCivil Engineering and ArchitectureNorthwestern Polytechnical University(NPU)Xi’an 710072China 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：2022年第65卷第10期

页      面：93-100页

核心收录：

学科分类：0710[理学-生物学] 1002[医学-临床医学] 1001[医学-基础医学(可授医学、理学学位)] 08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the National Natural Science Foundation of China(NSFC)(Grant No.51971178),financially supported by NSFC(Grant No.12072344) the Natural Science Basic Research Plan for Distinguished Young Scholars in Shaanxi Province(Grant No.2021JC-12) the Natural Science Foundation of Chongqing(Grant No.cstc2020jcyj-jq X0001) sponsored by the Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University(Grant No.CX2021015). the Youth Innovation Promotion Association of the Chinese Academy of Sciences financial 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 aging rejuvenation homogenous flow free volume 

摘      要：High-temperature deformation has been demonstrated as an effective measure to rejuvenate and optimize the mechanical properties of metallic glasses(MGs).Clarifying the competition between aging and rejuvenation during high-temperature deformation is helpful in rejuvenating MGs accurately.Signatures of aging and rejuvenation in a La_(30)Ce_(30)Ni_(10)Al_(20)Co_(10)MG were investigated via high-temperature deformation and mechanical relaxation.The coupling of thermal history,aging,and mechanical disordering determines the transient deformation and the structural state of MGs.The stress overshoot and anelastic deformation induce structural rejuvenation,increasing the concentration of defects and erasing thermal history.Therefore,the eventually steady-state condition is dependent on ambient temperature and strain rate instead of the initial structure.Furthermore,the one-to-one relationship between defect concentration and strain rate clarifies the structural nature of rejuvenation in amorphous materials.Such a relationship also contributes toward a comprehensive understanding of the structural rejuvenation behavior in amorphous materials.