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Short-range order and its impact on the CrCoNi medium-entropy alloy

机译：短距顺序及其对Crconi中熵合金的影响

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摘要

Traditional metallic alloys are mixtures of elements in which the atoms of minority species tend to be distributed randomly if they are below their solubility limit, or to form secondary phases if they are above it. The concept of multiple-principal-element alloys has recently expanded this view, as these materials are single-phase solid solutions of generally equiatomic mixtures of metallic elements. This group of materials has received much interest owing to their enhanced mechanical properties(1-5). They are usually called medium-entropy alloys in ternary systems and high-entropy alloys in quaternary or quinary systems, alluding to their high degree of configurational entropy. However, the question has remained as to how random these solid solutions actually are, with the influence of short-range order being suggested in computational simulations but not seen experimentally(6,7). Here we report the observation, using energy-filtered transmission electron microscopy, of structural features attributable to short-range order in the CrCoNi medium-entropy alloy. Increasing amounts of such order give rise to both higher stacking-fault energy and hardness. These findings suggest that the degree of local ordering at the nanometre scale can be tailored through thermomechanical processing, providing a new avenue for tuning the mechanical properties of medium- and high-entropy alloys.Metal alloys consisting of three or more major elemental components show enhanced mechanical properties, which are now shown to be correlated with short-range order observed with electron microscopy.
机译：传统金属合金是其中少数群体原子倾向于随机分布的元素的混合物，如果它们低于其溶解度限制，或者如果它们在其上方，则形成二次相。多主元素合金的概念最近扩大了这种观点，因为这些材料是金属元素的一般赤型混合物的单相固体溶液。由于其增强的机械性能（1-5），这组材料已经收到了很多兴趣。它们通常称为三元系统中的中熵合金，在四季或静态系统中的高熵合金，暗指其高度的配置熵。然而，问题仍然是如何随机这些固体解决方案实际上是，在计算模拟中建议的短距顺序的影响，但在实验上没有看到（6,7）。在这里，我们通过在Crconi中熵合金中使用能量过滤电子显微镜的结构特征来报告观察，其结构特征可归因于短距离顺序。增加的此类订单的增加产生了更高的堆叠故障能量和硬度。这些研究结果表明，纳米尺度的局部排序程度可以通过热机械加工来定制，提供新的途径，用于调节中高熵合金的机械性能。由三个或更多主要元素组成的组成的金属合金增强现在显示的机械性能与用电子显微镜观察到的短距离顺序相关。

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  • 来源
    《Nature》 |2020年第7808期|283-287|共5页
  • 作者

    Zhang Ruopeng; Zhao Shiteng; Ding Jun; Chong Yan; Jia Tao; Ophus Colin; Asta Mark; Ritchie Robert O.; Minor Andrew M.;

  • 作者单位

    Univ Calif Berkeley Dept Mat Sci & Engn Berkeley CA 94720 USA|Lawrence Berkeley Natl Lab Natl Ctr Electron Microscopy Mol Foundry Berkeley CA 94720 USA;

    Univ Calif Berkeley Dept Mat Sci & Engn Berkeley CA 94720 USA|Lawrence Berkeley Natl Lab Natl Ctr Electron Microscopy Mol Foundry Berkeley CA 94720 USA;

    Lawrence Berkeley Natl Lab Mat Sci Div Berkeley CA USA;

    Univ Calif Berkeley Dept Mat Sci & Engn Berkeley CA 94720 USA|Lawrence Berkeley Natl Lab Natl Ctr Electron Microscopy Mol Foundry Berkeley CA 94720 USA;

    Stanford Univ Dept Phys Stanford CA 94305 USA;

    Lawrence Berkeley Natl Lab Natl Ctr Electron Microscopy Mol Foundry Berkeley CA 94720 USA;

    Univ Calif Berkeley Dept Mat Sci & Engn Berkeley CA 94720 USA|Lawrence Berkeley Natl Lab Mat Sci Div Berkeley CA USA;

    Univ Calif Berkeley Dept Mat Sci & Engn Berkeley CA 94720 USA|Lawrence Berkeley Natl Lab Mat Sci Div Berkeley CA USA;

    Univ Calif Berkeley Dept Mat Sci & Engn Berkeley CA 94720 USA|Lawrence Berkeley Natl Lab Natl Ctr Electron Microscopy Mol Foundry Berkeley CA 94720 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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