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Dynamic mechanical responses of the Al_(0.1)CoCrFeNi high entropy alloy at cryogenic temperature

机译：al_（0.1）CoCrfeni高熵合金在低温温度下的动态机械响应

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摘要

In this work, dynamic compression experiments are carried-out at both room temperature (RT = 298 K) and liquid nitrogen temperature (LNT = 77 K) to systematically investigate the dynamic mechanical responses of the Al_(0.1)CoCrFeNi high entropy alloy (HEA). The yield strength significantly increases with the increasing strain rate. Even higher yield strengths are revealed when the temperature decreases from 298 K to 77 K. At cryogenic temperature, abundant nanoscale deformation twins are observed due to lower stacking fault energy (SFE). By introducing new interfaces in the grains and decreasing the mean free path of dislocations during deformation, the high density deformation twins that formed during dynamic deformation at 77 K lead to a higher degree of strain hardening rate. In addition, the low SFE results in widely dissociations and reactions of dislocations, which lead to the formation of Lomer-Cottrell (L-C) and Lomer dislocation locks. These immobile dislocation locks can act as both dislocation sources and barriers, which can also contribute to the outstanding strain hardening capability of the AloiCoCrFeNi HEA upon dynamic deformation at 77 K.
机译：在该工作中，在室温（RT = 298k）和液氮温度（LNT = 77k）的动态压缩实验中进行，以系统地研究AL_（0.1）COCRFENI高熵合金的动态机械响应（HEA ）。屈服强度随着应变率的增加而显着增加。当温度从298k到77k k时，揭示了甚至更高的屈服强度。在低温温度下，由于较低的堆叠故障能量（SFE），观察到丰富的纳米级变形双胞胎。通过在变形期间引入晶粒中的新界面并降低脱位的平均自由路径，在77k处动态变形期间形成的高密度变形双胞胎导致更高的应变硬化率。此外，低SFE导致脱位的广泛分解和反应，这导致洛米尔 - 科特尔（L-C）和洛米默脱位锁的形成。这些固定位错锁可以充当错位源和屏障，这也可以有助于ALOCOCRFENI HEA在77K的动态变形上的出色应变硬化能力。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|140125.1-140125.9|共9页
  • 作者

    Kun Jiang; Tengfei Ren; Guibin Shan; Tian Ye; Lianyang Chen; Cunxian Wang; Feng Zhao; Jianguo Li; Tao Suo;

  • 作者单位

    School of Aeronautics Northwestern Polytechnical University Xi'an 710072 China;

    School of Aeronautics Northwestern Polytechnical University Xi'an 710072 China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi an 710072 China;

    School of Aeronautics Northwestern Polytechnical University Xi'an 710072 China;

    School of Aeronautics Northwestern Polytechnical University Xi'an 710072 China;

    State Key Laboratory for Strength and Vibration of Mechanical Structures Department of Engineering Mechanics School of Aerospace Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China;

    Institute for Advanced Study Chengdu University Chengdu 610106 China;

    School of Aeronautics Northwestern Polytechnical University Xi'an 710072 China;

    School of Aeronautics Northwestern Polytechnical University Xi'an 710072 China Joint International Research Laboratory of Impact Dynamics and Its Engineering Application Xi'an 710072 China Shaanxi Key Laboratory of impact Dynamics and Its Engineering Application Xi'an 710072 China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    High entropy alloy; Dynamic responses; Deformation twinning; Lomer-cottrell locks;

    机译：高熵合金;动态响应;变形孪生;Lomer-Cottrell锁;

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