J. Mater. Sci. Technol. ›› 2023, Vol. 158: 53-62.DOI: 10.1016/j.jmst.2023.02.031

• Research article • Previous Articles     Next Articles

Training β relaxation to rejuvenate metallic glasses

L.T. Zhanga, Yun-Jiang Wangb,c, Y. Yangd,e, J.C. Qiaoa,f,*   

  1. aSchool of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China;
    bState Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
    cSchool of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China;
    dDepartment of Mechanical Engineering, College of Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong SAR, China;
    eDepartment of Materials Science and Engineering, College of Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong SAR, China;
    fInnovation Center, NPU-Chongqing, Chongqing 401135, China
  • Received:2023-01-20 Revised:2023-02-22 Accepted:2023-02-24 Published:2023-09-20 Online:2023-09-15
  • Contact: *School of Mechanics, Civil Engineering and Architec- ture, Northwestern Polytechnical University, Xi'an 710072, China. E-mail address:qjczy@nwpu.edu.cn (J.C. Qiao)

Abstract: In the current work, we demonstrated that the rejuvenation of metallic glasses can be achieved through training the β relaxation process. With the increase in the training frequency, a transition from structural relaxation to rejuvenation can be observed. This rejuvenation treatment is unexpected due to it occurs at a relatively small cyclic strain of 0.2%. Rejuvenation is beneficial to increase the relaxation enthalpy and promotes the decoupling of the β relaxation process and α relaxation process. A cluster of β relaxation time curves are formulated to describe any energetic state between ultrastable and ultimately rejuvenated metallic glasses. In addition, rejuvenation expands the distribution of β relaxation process, anelastic and viscoplastic components during the deformation process.

Key words: Metallic glass, β relaxation, Rejuvenation, Structural heterogeneity