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首页> 外文期刊>Materials Science and Engineering >Tuning the mechanical behavior of high-entropy alloys via controlling cooling rates
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Tuning the mechanical behavior of high-entropy alloys via controlling cooling rates

机译：通过控制冷却速度调节高熵合金的力学行为

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摘要

The microstructures determine the macro-mechanical properties in metals and alloys. However, the formation mechanism of microstructures in high-entropy alloys (HEAs) rapidly cooled to room temperature still remains unknown at nanoscale. Here, we present the AlCoCrCuFeNi HEM prepared by various cooling rates and the deformation behaviour using molecular dynamic simulation. The results show that the radial distribution function of HEM is in good agreement with the previous experimental result. The amorphous HEA is formed at high cooling rates, while the nanocrystalline HEA is generated at low cooling rates. The hybrid amorphous crystallization structured HEA occurs at middle cooling rates. For low cooling rates, the considerable amount of face-centered-cubic and hexagonal-close-packed short-range orders clearly show the crystal-nucleation process in the supercooled liquid of HEAs. The high residual hydrostatic stress around grain boundaries is observed in the nanocrystaline HEAs. Moreover, the nanocrystal HEA presents a high strength, compared to the amorphous HEA. The amorphous HEA exhibits the stable flow stress due to no obvious local stress concentration. This result could help guide the preparation of HEM with a high strength by controlling the cooling rate, which generates the structural hierarchy.
机译：微观结构确定金属和合金中的宏观力学性能。然而，在高熵合金（HEAS）中的微观结构的形成机制迅速冷却至室温仍然在纳米级仍然未知。在这里，我们使用各种冷却速率和使用分子动态模拟制备的Alcocrcufeni下摆和使用分子动态模拟的变形行为。结果表明，下摆的径向分布功能与先前的实验结果吻合良好。无定形Hea以高冷却速率形成，而纳米晶Hea以低冷却速率产生。杂交无定形结晶结构化Hea在中冷速率下发生。对于低冷却速率，相当数量的面心立方体和六边形 - 近距离填充的短距离顺序清楚地显示了艾萨的过冷液中的晶体成核过程。在纳米晶体HEA中观察到晶界周围的高残留静压应力。此外，与无定形HEA相比，纳米晶体Hea具有高强度。由于没有明显的局部应力集中，无定形HEA表现出稳定的流量应力。通过控制产生结构层次结构，该结果可以帮助指导具有高强度的下摆的制备。

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  • 来源
    《Materials Science and Engineering》 |2019年第jul8期|359-365|共7页
  • 作者

    Li Jia; Chen Haotian; Li Sixu; Fang Qihong; Liu Yong; Liang Luxing; Wu Hong; Liaw Peter K.;

  • 作者单位

    Hunan Univ State Key Lab Adv Design & Mfg Vehicle Body Changsha 410082 Hunan Peoples R China;

    Hunan Univ State Key Lab Adv Design & Mfg Vehicle Body Changsha 410082 Hunan Peoples R China;

    Hunan Univ State Key Lab Adv Design & Mfg Vehicle Body Changsha 410082 Hunan Peoples R China;

    Hunan Univ State Key Lab Adv Design & Mfg Vehicle Body Changsha 410082 Hunan Peoples R China;

    Cent S Univ State Key Lab Powder Met Changsha 410083 Hunan Peoples R China;

    Cent S Univ State Key Lab Powder Met Changsha 410083 Hunan Peoples R China;

    Cent S Univ State Key Lab Powder Met Changsha 410083 Hunan Peoples R China;

    Univ Tennessee Dept Mat Sci & Engn Knoxville TN 37996 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cooling rate; Molecular dynamics simulation; Solidification; High-entropy alloys; Plastic deformation;

    机译：冷却速率;分子动力学模拟;凝固;高熵合金;塑性变形;

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