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L2_1-strengthened face-centered cubic high-entropy alloy with high strength and ductility

机译：L2_1 - 强化面朝式立方高熵合金，强度和延展性

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摘要

Face-centered cubic (FCC) high-entropy alloys (HEAs) strengthened by coherent L1_2-nanoparticles exhibit an excellent strength-ductility balance. However, the strength of previously studied HEAs remains inadequate for the requirements of high-performance structural applications, due to their emphasis on coherency strengthening and the suppression of the formation of incoherent precipitates, which could substantially increase the alloy strength but also leads to significant brittleness. In this study, we propose to employ incoherent precipitates as additional strengthening phases to further improve the mechanical performance of conventional L1_2-strength-ened FCC HEAs without dramatic loss of their ductility. We achieve this using a prototypical (FeCoNiCr)_(89)Ti_6Al_5 (at.%) HEA, in which high-density, fine, and incoherent L2_1 precipitates were introduced and uniformly distributed at the recrystallized grain boundaries through proper thermomechanical processes, including large cold deformation, full recrystallization, and aging heat treatment. A superb combination of strength and ductility in the alloy is confirmed by the uniaxial tensile tests, with a yield strength of 1136 MPa, an ultimate tensile strength of 1597 MPa, and a ductility of 25.3%. This superior mechanical response is caused by the synergistic contribution of the fine and uniformly distributed L2_1 particles and the ultra-ductile and damage-tolerant FeCoNiCr matrix, which are responsible for increasing strength and maintaining ductility, respectively. These findings demonstrate the viability of a new method of using incoherent precipitates to strengthen other FCC HEAs by properly tuning their particle size and distribution.
机译：通过相干L1_2-纳米粒子强化的面为中心的立方（FCC）高熵合金（HEAS）表现出优异的强度 - 延展性平衡。然而，由于它们强调相干性强调和抑制不连贯的沉淀物的抑制，因此可以对高性能结构应用的要求仍然不足，这可能会显着增加合金强度，而且导致显着的脆性，而且抑制了高性能结构应用的要求仍然不足。 。在这项研究中，我们提出使用不连贯的沉淀物作为额外的强化相，以进一步改善常规L1_2-强度的FCC HEA的机械性能而不会急剧丧失它们的延展性。我们使用一种原型（Feconicr）_（89）Ti_6Al_5（AT.％）HEA来实现这一点，其中通过适当的热机械过程引入并均匀地分布在重结晶的晶界，包括大型的重结晶晶界，包括大冷变形，全重结晶和老化热处理。通过单轴拉伸试验证实了合金中强度和延展性的优异组合，屈服强度为1136MPa，最终拉伸强度为1597MPa，延展性为25.3％。这种卓越的机械响应是由精细和均匀分布的L2_1颗粒的协同贡献和超延展性和耐损害的Feconicr基质，它们分别负责增加强度和保持延展性。这些研究结果证明了一种新方法使用非相干沉淀方法，通过适当地调整其粒度和分布来加强其他FCC HEA。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|140056.1-140056.9|共9页
  • 作者

    Yongliang Qi; Yake Wu; Tinghui Cao; Lin He; Feng Jiang; Jun sun;

  • 作者单位

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xian Shanxi 710049 China;

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xian Shanxi 710049 China;

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xian Shanxi 710049 China;

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xian Shanxi 710049 China;

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xian Shanxi 710049 China;

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xian Shanxi 710049 China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    High-entropy alloys; Incoherent; L2_1; Strength; Grain boundary;

    机译：高熵合金;不连贯的;l2_1;力量;晶界;

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