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Ti20Zr20Hf20Cu20Be20高熵非晶合金应力弛豫行为研究
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中国矿业大学

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江苏省自然科学基金项目(BK20180659);中央高校基本科研业务费专项资金(2018QNA05);江苏省双创团队、双创博士项目


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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    摘要:

    高熵非晶合金力学弛豫行为的研究,对于理解玻璃转变、塑性变形、弛豫机理等科学问题和拓展其工程应用极为关键。本文采用应力分析方法对Ti20Zr20Hf20Cu20Be20高熵非晶合金条带进行了研究,旨在揭示高熵非晶合金应力弛豫行为。通过分析其在恒定应变下较宽时间窗口和温度窗口内的应力衰减过程,发现在低于Tg的玻璃态下,高熵非晶合金中存在着弛豫解耦现象,分别是慢弛豫和快弛豫过程。其中慢弛豫呈现扩展指数衰减模式,弛豫时间存在对温度的Arrhenius动力学依赖关系,与长程原子重排运动有关,快弛豫过程对应于微观局部内应力的逐步消散过程。不论该高熵非晶合金变形处于弹性阶段还是发生了屈服,应力弛豫过程受应变的影响都较小。本研究揭示了高熵非晶合金中新的弛豫解耦现象和与之相关的独特动力学机制,拓宽了我们对高熵非晶合金弛豫动力学过程以及其本征特性的认知。

    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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陈长玖,许锐,张金勇,张平,何业増,沈宝龙. Ti20Zr20Hf20Cu20Be20高熵非晶合金应力弛豫行为研究[J].稀有金属材料与工程,2021,50(12):4381~4387.[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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历史
  • 收稿日期:2020-12-10
  • 最后修改日期:2021-03-08
  • 录用日期:2021-04-15
  • 在线发布日期: 2022-01-09
  • 出版日期: 2021-12-24