Micro-mechanical properties of new alternative binders for cemented carbides: CoCrFeNiWx high-entropy alloys
Micro-mechanical properties of new alternative binders for cemented carbides: CoCrFeNiWx high-entropy alloys
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DOI：
10.1016/j.jallcom.2019.153141
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发表时间：
2020-04-15
影响因子：
6.2
通讯作者：
Lizarraga, Raquel
中科院分区：
文献类型：
--
作者：
Li, Xiaoqing;Wei, Daixiu;Lizarraga, Raquel
高熵合金是一种具有优异性能的新型材料，由于其元素组成的自由度大，提供了多种可能性。特别是CoCrFeNiW合金，由于其在解决硬质合金工业中长期存在的钴替代问题方面的潜在用途，最近引起了人们的广泛关注。对这些多组分合金的实验和理论研究的缺乏阻碍了它们的优化发展。在这项工作中，我们旨在通过采用第一性原理合金理论和实验技术研究它们的力学性能来填补这一空白。通过计算得到的弹性参数，我们分析了材料的力学稳定性、弹性各向异性、德拜温度和导出的多晶模量。此外，我们制备了CoCrFeNi和（CoCrFeNi）（0.）W-96(0.04)，并用x射线衍射和电子背散射衍射对它们进行了分析。测量了硬度和杨氏模量。将杨氏模和晶格参数与第一性原理计算结果进行了比较，得到了较好的一致性。硬度随W含量的增加而增加。(C) 2019 Elsevier B.V.版权所有
High-entropy alloys are a new type of materials with excellent properties that offer a great variety of possibilities due to the large degree of freedom in element composition. In particular, CoCrFeNiW alloys have recently attracted a lot of attention due to their potential use in solving the long-standing problem of substituting cobalt in the cemented carbide industry. The lack of experimental and theoretical studies on these multi-components alloys hinders their optimal development. In this work, we aim at filling in this gap by studying their mechanical properties employing first-principles alloy theory and experimental techniques. By using the calculated elastic parameters, we analyzed the mechanical stability, elastic anisotropy, Debye temperature, and derived polycrystalline moduli. Moreover, we fabricated CoCrFeNi and (CoCrFeNi)(0.)W-96(0.04) and analyzed them by means of X-ray diffraction and electron backscatter diffraction. The hardness and the Young's modulus were measured. The Young's moduli and the lattice parameters were compared to first principles calculations and good agreement was obtained. Hardness increases with the increment of W composition. (C) 2019 Elsevier B.V. All rights reserved.