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Mode Stress Relaxation of Ti20Zr20Hf20Cu20Be20 High-Entropy Metallic Glasses
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School of Materials Science and Physics,China University of Mining and Technology,Xuzhou

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Natural Science Foundation of Jiangsu Province (BK20180659);Fundamental Research Funds for the Central Universities (Grant No. 2018QNA05); Program for High-Level Entrepreneurial and Innovative Talents Group in Jiangsu Province; the Program for Doctor of Entrepreneurial and Innovative Talents in Jiangsu Province

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    Abstract:

    Mechanical relaxation behavior of high-entropy metallic glasses is not only crucial for understanding the glass transition phenomenon, plastic deformation and relaxation mechanism but also help for extending their application in engineering. The mechanical relaxation behavior of Ti20Zr20Hf20Cu20Be20 high-entropy metallic glass (HE-MG) was investigated by static stress relaxation analysis in the current research. With a constant strain, the stress relaxation process was analyzed in a wide time window and temperature range. A decoupling of the relaxation into a two-step (slow relaxation and fast relaxation) was found in the glass state below Tg. The slow relaxation process exhibits a stretched decay and a significant Arrhenius dependence on the temperature. The relaxation time decreases sharply with the increase of temperature, which may relate to the long-range atomic rearrangements at larger scales. The fast relaxation relates to the atomic scale internal stress dissipation. In addition, the strain has no distinct influence on the stress relaxation process, whether high-entropy metallic glass is deformed at the elastic stage or yields. This study reveals the decoupling phenomenon and the related unique dynamics relaxation mechanism in high-entropy metallic glass, which will enhance our understanding of the mechanical relaxation behavior and intrinsic characteristics of high-entropy metallic glasses.

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[Chen Changjiu, Xu Rui, Zhang Jinyong, Zhang Ping, He Yezeng, Shen Baolong. Mode Stress Relaxation of Ti20Zr20Hf20Cu20Be20 High-Entropy Metallic Glasses[J]. Rare Metal Materials and Engineering,2021,50(12):4381~4387.]
DOI:10.12442/j. issn.1002-185X.20200949

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History
  • Received:December 10,2020
  • Revised:March 08,2021
  • Adopted:April 15,2021
  • Online: January 09,2022
  • Published: December 24,2021