Elastic behavior of binary and ternary refractory multi-principal-element alloys
Elastic behavior of binary and ternary refractory multi-principal-element alloys
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DOI：
10.1016/j.matdes.2022.110820
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
R. Feng;George Kim;Dunji Yu;Yan Chen;Wei Chen;P. Liaw;Ke An
中科院分区：
文献类型：
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作者：
R. Feng;George Kim;Dunji Yu;Yan Chen;Wei Chen;P. Liaw;Ke An
弹性性能对材料的机械性能至关重要，因此可以调整以设计高性能材料。在这项研究中，弹性常数的等原子的三元难熔多主元素合金，NbTiV，和MoNbV，进行了研究，usingin-situneutron衍射和第一性原理计算。实验测量和理论预测的弹性常数显示出良好的一致性。研究了在NbV基合金中添加Ti和Mo对弹性常数的合金化作用。特别地，向NbV合金中添加Ti元素导致齐纳各向异性比从0.59增加到0.99，从而形成弹性各向同性NbTiV合金，而添加Mo使各向异性比降低到0.52。Pugh比（B/G）、Cauchy压力（C12-C44）和泊松比（ν）被用来预测所研究合金的脆/韧性性质，这与力学结果一致。本工作提供了有价值的见解设计的韧性和强大的耐火高熵合金的弹性性能的调整。
Elastic properties are essential to the mechanical performance of materials, and therefore, can be tuned to design high-performance materials. In this study, the elastic constants of the equiatomic ternary refractory multi-principal-element alloys, NbTiV, and MoNbV, were investigated, usingin-situneutron diffraction and first-principles calculations. The experimentally measured and theoretically predicted elastic constants show a good agreement. The alloying effect of adding Ti and Mo into NbV base alloy on the elastic constants is studied. Particularly, adding Ti elements into the NbV alloy results in the increase of the Zener anisotropy ratio from 0.59 to 0.99, leading to the formation of the elastically isotropic NbTiV alloy, while the addition of Mo decreases the anisotropy ratio to 0.52. Pugh’s ratio (B/G), Cauchy pressure (C12-C44), and Poisson’s ratio (ν) are used to predict the brittle/ductile nature of the studied alloys, which is consistent with the mechanical results. The present work provides valuable insights into the design of ductile and strong refractory high-entropy alloys by tuning the elastic properties.