中国物理B ›› 2021, Vol. 30 ›› Issue (6): 66401-066401.doi: 10.1088/1674-1056/abd92c

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Crystallization evolution and relaxation behavior of high entropy bulk metallic glasses using microalloying process

Danhong Li(李丹虹)1,†, Changyong Jiang(江昌勇)1, Hui Li(栗慧)1, and Mahander Pandey2,‡   

  1. 1 Changzhou Institute of Technology, Changzhou 213000, China;
    2 Department of Materials Science and Metallurgical Engineering, Heydarabad 502258, India
  • 收稿日期:2020-09-13 修回日期:2020-12-13 接受日期:2021-01-07 出版日期:2021-05-18 发布日期:2021-06-05
  • 通讯作者: Danhong Li, Mahander Pandey E-mail:lidh@czust.edu.cn;Pandey.mahander1@gmail.com

Crystallization evolution and relaxation behavior of high entropy bulk metallic glasses using microalloying process

Danhong Li(李丹虹)1,†, Changyong Jiang(江昌勇)1, Hui Li(栗慧)1, and Mahander Pandey2,‡   

  1. 1 Changzhou Institute of Technology, Changzhou 213000, China;
    2 Department of Materials Science and Metallurgical Engineering, Heydarabad 502258, India
  • Received:2020-09-13 Revised:2020-12-13 Accepted:2021-01-07 Online:2021-05-18 Published:2021-06-05
  • Contact: Danhong Li, Mahander Pandey E-mail:lidh@czust.edu.cn;Pandey.mahander1@gmail.com

摘要: The role of the microalloying process in relaxation behavior and crystallization evolution of Zr20Cu20Ni20Ti20Hf20 high entropy bulk metallic glass (HEBMG) was investigated. We selected Al and Nb elements as minor elements, which led to the negative and positive effects on the heat of mixing in the master HEBMG composition, respectively. According to the results, both elements intensified β relaxation in the structure; however, α relaxation remained stable. By using different frequencies in dynamic mechanical analysis, it was revealed that the activation energy of β relaxation for the Nb-added sample was much higher, which was due to the creation of significant structural heterogeneity under the microalloying process. Moreover, it was found that Nb addition led to a diversity in crystallization stages at the supercooled liquid region. It was suggested that the severe structural heterogeneity in the Nb-added sample provided multiple energy-level sites in the structure for enhancing the crystallization stages.

关键词: metallic glasses, disordered structures, amorphous materials, relaxation

Abstract: The role of the microalloying process in relaxation behavior and crystallization evolution of Zr20Cu20Ni20Ti20Hf20 high entropy bulk metallic glass (HEBMG) was investigated. We selected Al and Nb elements as minor elements, which led to the negative and positive effects on the heat of mixing in the master HEBMG composition, respectively. According to the results, both elements intensified β relaxation in the structure; however, α relaxation remained stable. By using different frequencies in dynamic mechanical analysis, it was revealed that the activation energy of β relaxation for the Nb-added sample was much higher, which was due to the creation of significant structural heterogeneity under the microalloying process. Moreover, it was found that Nb addition led to a diversity in crystallization stages at the supercooled liquid region. It was suggested that the severe structural heterogeneity in the Nb-added sample provided multiple energy-level sites in the structure for enhancing the crystallization stages.

Key words: metallic glasses, disordered structures, amorphous materials, relaxation

中图分类号:  (Metallic glasses)

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