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    Connection between Mechanical Relaxation and Equilibration Kinetics in a High-Entropy Metallic Glass

    Y. J. Duan1,2, M. Nabahat2, Yu Tong3, L. Ortiz-Membrado4, E. Jiménez-Piqué4, Kun Zhao5,6, Yun-Jiang Wang5,6, Y. Yang7,8, T. Wada9 et al.

    H. Kato9, J. M. Pelletier10, J. C. Qiao1,*, and E. Pineda2,†

    • 1School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an 710072, China
    • 2Department of Physics, Institute of Energy Technologies, Universitat Politècnica de Catalunya, Barcelona 08019, Spain
    • 3CAS Key Laboratory of Magnetic Materials and Devices, and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
    • 4Department of Materials Science, Universitat Politècnica de Catalunya, Barcelona 08019, Spain
    • 5State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
    • 6School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
    • 7Department of Mechanical Engineering, College of Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong SAR, China
    • 8Department of Materials Science and Engineering, College of Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong SAR, China
    • 9Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
    • 10Université de Lyon, MATEIS, UMR CNRS5510, Bâtiment Blaise Pascal, INSA-Lyon, F-69621 Villeurbanne Cedex, France

    • *Corresponding author: qjczy@nwpu.edu.cn
    • †Corresponding author: eloi.pineda@upc.edu

    Phys. Rev. Lett. 132, 056101 – Published 29 January, 2024

    DOI: https://doi.org/10.1103/PhysRevLett.132.056101

    Abstract

    The slow transition from an out-of-equilibrium glass towards a supercooled liquid is a complex relaxation phenomenon. In this Letter, we study the correlation between mechanical relaxation and equilibration kinetics in a Pd20Pt20Cu20Ni20P20 high-entropy metallic glass. The evolution of stress relaxation with aging time was obtained with an unprecedented detail, allowing us to pinpoint new interesting features. The long structural relaxation towards equilibrium contains a wide distribution of activation energies, instead of being just associated to the β relaxation as commonly accepted. The stress relaxation time can be correlated with the equilibration rate and we observe a decrease of microstructural heterogeneity which contrasts with an increase of dynamic heterogeneity. These results significantly enhance our insight of the interplay between relaxation dynamics and thermodynamics in metallic glasses.

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