J. Mater. Sci. Technol. ›› 2024, Vol. 178: 70-79.DOI: 10.1016/j.jmst.2023.08.047

• Research Article • Previous Articles     Next Articles

Unusual gradient stress induced superior room-temperature plasticity in brittle ferromagnetic bulk metallic glass

Meng Wanga,b, Weiming Yanga,*, Si Lanc, Zongzhen Lid, Qianqian Wange, Wenyu Lia, Jing Taof, Jing Zhoue, Qiang Lig, Haishun Liuh,*, Akihisa Inouei,*   

  1. aSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China;
    bSchool of Opto-electronic Engineering, Zaozhuang University, Zaozhuang 277160, China;
    cHerbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing 210094, China;
    dJiangsu JITRI Advanced Energy Materials Research Institute Co., Ltd., Changzhou 213001, China;
    eSchool of Materials Science and Engineering, Southeast University, Nanjing 211189, China;
    fSchool of Mechanical Engineering, Sichuan University of Science and Engineering, Zigong 643000, China;
    gSchool of Physics Science and Technology, Xinjiang University, Urumqi 830046, China;
    hSchool of Materials Sciences and Physics, China University of Mining and Technology, Xuzhou 221116, China;
    iInternational Institute of Green Materials, Josai International University, Togane, 283-8555, Japan
  • Received:2023-07-14 Revised:2023-07-29 Accepted:2023-08-08 Published:2024-04-10 Online:2023-10-10
  • Contact: * E-mail addresses: wmyang@cumt.edu.cn (W. Yang), liuhaishun@126.com (H. Liu), ainouebmg@yahoo.co.jp (A. Inoue).

Abstract: Ferromagnetic bulk metallic glasses (FBMGs) possess excellent soft magnetic properties, good corrosion resistance, and high strength. Unfortunately, their commercial utility is limited by their brittleness. In this work, we report the enhancement in the room-temperature plasticity during the compression (25%) and bending flexibility of Fe74Mo6P13C7 FBMG by using water quenching. The high-energy synchrotron X-ray measurements, high-resolution transmission electron microscopy, three-dimensional X-ray microtomography, and finite element simulation were performed to reveal the origin. It was found that the M-shape profile of residual stress improves the mechanical properties of FBMGs, particularly their plasticity. The reversal of the heat-transfer coefficient and cooling rate from the ‘vapor blanket’ to ‘nucleate boiling’ transition during water quenching processing is the main cause of the unusual profile of residual stress in glassy cylinders. Encouraged by the progress in developing flexible silicate glasses, this work highlights a processing method to improve plasticity and surmount technical barriers for the commercialization of FBMGs.

Key words: Ferromagnetic bulk metallic glasses, Plasticity, Flexibility, Residual stress