Coherent precipitation and stability of cuboidal nanoparticles in body-centered-cubic Al0.4Nb0.5Ta0.5TiZr0.8 refractory high entropy alloy
Coherent precipitation and stability of cuboidal nanoparticles in body-centered-cubic Al0.4Nb0.5Ta0.5TiZr0.8 refractory high entropy alloy
复制标题
体心立方Al0.4Nb0.5Ta0.5TiZr0.8难熔高熵合金中立方纳米粒子的相干沉淀及其稳定性
DOI：
10.1016/j.scriptamat.2020.08.029
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发表时间：
2021-01-01
影响因子：
6
通讯作者：
Liaw, Peter K.
中科院分区：
文献类型：
--
作者：
Wang, Qing;Han, Jincan;Liaw, Peter K.
本工作开发了一种新的体心立方（BCC）基Al0.4Nb0.5Ta0.5TiZr0.8共格析出高熵耐火合金。873 K时效合金中尺寸为25-50 nm的立方纳米沉淀物的形成归因于适度的晶格失配。Zr 5Al 3相也由于相似的化学组成而与B2以相同的颗粒形状共存，其中Ti在B2中富集而在Zr 5Al 3中不富集。随着时效温度的升高，BCC/B-2共格性变差，只剩下粗大的Zr 5Al 3。此外，由于Nb/Ta和Ti/Zr的偏聚，还存在两种BCC相。(C)2020 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The present work developed a new body-centered-cubic (BCC)-based Al0.4Nb0.5Ta0.5TiZr0.8 refractory high entropy alloy with coherent precipitation. The formation of cuboidal nanoprecipitates with a size of 25-50 nm in an 873 K-aged alloy is ascribed to a moderate lattice misfit. A Zr5Al3 phase also coexists with B2 in a same particle shape due to similar chemical compositions, in which Ti is enriched in B2 but not in Zr5Al3. The BCC/B-2 coherency would be deteriorated with increasing the aging temperature, leaving coarse Zr5Al3 alone. Besides, there exist two kinds of BCC phases due to the segregations of Nb/Ta and Ti/Zr. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.