Precipitation strengthening in a hot-worked TiNbTa0.5ZrAl0.5 refractory high entropy alloy
Precipitation strengthening in a hot-worked TiNbTa0.5ZrAl0.5 refractory high entropy alloy
复制标题
热加工 TiNbTa0.5ZrAl0.5 难熔高熵合金的沉淀强化
DOI：
10.1016/j.matlet.2019.03.075
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发表时间：
2019-07-01
影响因子：
3
通讯作者：
Liu, Ruiping
中科院分区：
文献类型：
--
作者：
Cao, Yuankui;Liu, Yong;Liu, Ruiping
A TiNbTa0.5ZrAl0.5 refractory high entropy alloy was prepared by powder metallurgy and subsequently subjected to hot forging and annealing. Precipitation behavior and mechanical properties of the hot-worked TiNbTa0.5ZrAl0.5 alloy were investigated. Results show that the hot forging leads to a formation of (Zr, Al)-rich HCP precipitates in the initial BCC matrix. The precipitates have significant strengthening effect on the TiNbTa0.5ZrAl0.5 alloy after annealing at 1000 degrees C for 2 h. Owing to the precipitation strengthening, the hot-worked TiNbTa0.5ZrAl0.5 alloy exhibits a high compressive yield strength of 1740 MPa with a compressive stain of 20%. It is interesting that annealing at lower or higher temperatures than 1000 degrees C causes a degradation in compression properties, mainly due to the decomposition of the BCC matrix and the coarsening of the HCP precipitates. (C) 2019 Elsevier B.V. All rights reserved.
