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Refractory alloying additions on the thermal stability and mechanical properties of high-entropy alloys

机译：耐火合金化对高熵合金的热稳定性和机械性能的添加

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摘要

In this study, alloying effects of Mo and W refractory elements on the microstructural evolution of high-entropy alloys (HEAs) were systematically studied. High-density L1_2-type precipitates formed during the isothermal treatment at 800 °C. Alloying additions of Mo and W displayed different partitioning behaviors between the matrix and precipitate phases, with Mo partitioning to the matrix phase (K_(mo) = 0.45) and W partitioning to the precipitates (K_w = 1.52) in the 1.5 at.% Mo and 1.5 at.% W alloyed HEA, respectively. A reversal in the partition of W back to the matrix (K_w = 0.95) was identified for the combined Mo and W alloying. It was demonstrated that W not only destabilized the Heusler phase at grain boundaries but also increased the volume fraction of the precipitates. In addition, lattice misfit was significantly reduced after alloying with these refractory additions. The coarsening kinetics was also quantitatively described according to the modified-Lifshitz-Slyozov-Wagner model. The coarsening rate constant for the HEAs was significantly reduced as comparison with that for Ni-and Co-based superalloys, implying an improved thermal stability of HEAs. Moreover, a reduced interfacial energy together with inherently small diffusivity of the refractory elements attributed to the improved thermal stability. Our findings show the remarkable thermal stability for HEAs and the potential for HEAs to be developed as new high-temperature structural materials.
机译：在本研究中，系统地研究了Mo和W耐火元件对高熵合金（HEAS）的微观结构演化的合金化效应。在800℃下在等温处理期间形成的高密度L1_2型沉淀物。 Mo和W的合金加入在基质和沉淀相之间显示不同的分区行为，用Mo分配给基质相（K_（Mo）= 0.45），并且W在1.5℃下析出到沉淀物（K_W = 1.52）。％Mo 1.5 at。％w合金化hea。为组合的MO和W合金化鉴定了返回基质（K_W = 0.95）的逆转。结果证明，W不仅使HEUSLER阶段变得破坏了晶界，而且还增加了沉淀物的体积分数。此外，通过这些耐火添加剂合金化后，晶格错配明显减少。还根据改性的Lifshitz-Slyozov-WAGNER模型定量描述粗化动力学。与Ni-and Co-and Co-any基超合金的比较显着降低了HEA的粗化速率常数，这意味着提高了HEA的热稳定性。此外，将界面能量降低，与改善的热稳定性归因于耐火元件的固有小扩散性。我们的研究结果表明，批发人的卓越热稳定性以及批发的兴趣是新的高温结构材料。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|140020.1-140020.13|共13页
  • 作者

    B.X. Cao; T. Yang; L. Fan; J.H. Luan; Z.B. Jiao; C.T. Liu;

  • 作者单位

    Department of Materials Sciences and Engineering City University of Hong Kong Hong Kong China;

    Department of Mechanical Engineering City University of Hong Kong Hong Kong China;

    Department of Mechanical Engineering The Hong Kong Polytechnic University Hong Kong China;

    Department of Mechanical Engineering City University of Hong Kong Hong Kong China;

    Department of Mechanical Engineering The Hong Kong Polytechnic University Hong Kong China;

    Department of Materials Sciences and Engineering City University of Hong Kong Hong Kong China Department of Mechanical Engineering City University of Hong Kong Hong Kong China;

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  • 正文语种 eng
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  • 关键词

    Precipitation-hardened high-entropy alloys; Refractory elements; Coarsening behavior; Lattice misfit; Thermal stability;

    机译：沉淀硬化的高熵合金;耐火元素;粗化行为;格子错过;热稳定性;

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