中国物理B ›› 2021, Vol. 30 ›› Issue (6): 66301-066301.doi: 10.1088/1674-1056/abf111

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Hydrogen-induced dynamic slowdown of metallic glass-forming liquids

Jin-Ai Gao(高津爱), Hai-Shen Huang(黄海深), and Yong-Jun Lü(吕勇军)   

  1. School of Physics, Beijing Institute of Technology, Beijing 100081, China
  • 收稿日期:2021-01-30 修回日期:2021-03-15 接受日期:2021-03-23 出版日期:2021-05-18 发布日期:2021-05-20
  • 通讯作者: Yong-Jun Lu E-mail:yongjunlv@bit.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 52071029). The computer resources at the Shanghai and Tianjin Supercomputer Centers are gratefully acknowledged.

Hydrogen-induced dynamic slowdown of metallic glass-forming liquids

Jin-Ai Gao(高津爱), Hai-Shen Huang(黄海深), and Yong-Jun Lü(吕勇军)   

  1. School of Physics, Beijing Institute of Technology, Beijing 100081, China
  • Received:2021-01-30 Revised:2021-03-15 Accepted:2021-03-23 Online:2021-05-18 Published:2021-05-20
  • Contact: Yong-Jun Lu E-mail:yongjunlv@bit.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 52071029). The computer resources at the Shanghai and Tianjin Supercomputer Centers are gratefully acknowledged.

摘要: Dynamics of hydrogen doped Cu50Zr50 glass-forming liquids are investigated by using the newly developed modified embedded atomic method (MEAM) potential based on molecular dynamics simulations. We find that the doping of hydrogen atoms slows down the relaxation dynamics, reduces the fragility of supercooled melts, and promotes the occurrence of glass transitions. The dynamic slowdown is suggested to be closely related to the effect of hydrogen atoms on locally ordered structure of melts. With increasing concentration of hydrogen, the five-fold symmetry associated with Cu- and Zr-centered polyhedrons is lowered, on the other hand, the local order featuring metal hydrides is enhanced. The latter dominates the dynamic behaviors of glass-forming liquids, especially for Zr atoms, and results in the dynamic slowdown.

关键词: metallic glasses, hydrogen, dynamics

Abstract: Dynamics of hydrogen doped Cu50Zr50 glass-forming liquids are investigated by using the newly developed modified embedded atomic method (MEAM) potential based on molecular dynamics simulations. We find that the doping of hydrogen atoms slows down the relaxation dynamics, reduces the fragility of supercooled melts, and promotes the occurrence of glass transitions. The dynamic slowdown is suggested to be closely related to the effect of hydrogen atoms on locally ordered structure of melts. With increasing concentration of hydrogen, the five-fold symmetry associated with Cu- and Zr-centered polyhedrons is lowered, on the other hand, the local order featuring metal hydrides is enhanced. The latter dominates the dynamic behaviors of glass-forming liquids, especially for Zr atoms, and results in the dynamic slowdown.

Key words: metallic glasses, hydrogen, dynamics

中图分类号:  (Glasses and amorphous solids)

  • 63.50.Lm
64.70.pe (Metallic glasses) 62.20.mj (Brittleness)