Controlling microstructure and mechanical properties of Ti-V-Cr-Nb-Ta refractory high entropy alloys through heat treatments
Controlling microstructure and mechanical properties of Ti-V-Cr-Nb-Ta refractory high entropy alloys through heat treatments
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DOI：
10.1016/j.jallcom.2022.167651
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发表时间：
2022-10-22
影响因子：
6.2
通讯作者：
Armstrong, David E. J.
中科院分区：
文献类型：
--
作者：
Liu, Junliang;Scales, Robert J.;Armstrong, David E. J.
在本研究中，我们研究了Ti-V-Cr5-Nb-Ta和Ti-V-Cr-Nb-Ta两种难熔高熵合金（RHEAs）在铸态和热处理条件下的显微组织和力学性能。两种合金均表现为几乎单相的BCC组织，均质热处理后形成了不同尺寸和体积分数的二次相。主要次级相为复合C15 Laves结构，组成为（Ti, Ta）（V, Cr, Nb）2。纳米压痕图表明C15 Laves相非常硬且脆，进行均质热处理可以提高两种合金的硬度。讨论了均匀化热处理后硬度变化与显微组织演变的关系。(c) 2022作者。这是一篇基于CC by许可（http:// creativecommons.org/licenses/by/4.0/）的开放获取文章。
In this study, we have investigated the microstructure and mechanical properties of two refractory high entropy alloys (RHEAs), Ti-V-Cr5-Nb-Ta and Ti-V-Cr-Nb-Ta, in their as-cast and heat-treated conditions. Both alloys show almost single-phase BCC structure, while different size and volume fraction of secondary phases were formed after homogenisation heat treatment. The major secondary phase was indexed as a complex C15 Laves structure with a composition of (Ti, Ta)(V, Cr, Nb)2. The nanoindentation mapping indicates C15 Laves phase is very hard and brittle, performing a homogenisation heat treatment leads to an improved hardness in both alloys. The correlations between hardness changes and microstructural evolutions after homogenisation heat treatment are also discussed.(c) 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).