Consideration of kinetics on intermetallics formation in solid-solution high entropy alloys

被引：53
作者：
Chou, T. H. [1 ,2 ]
Huang, J. C. [1 ,2 ]
Yang, C. H. [3 ]
Lin, S. K. [3 ,4 ]
Nieh, T. G. [1 ,5 ]
机构：
[1] City Univ Hong Kong, Hong Kong Inst Adv Study, Dept Mat Sci & Engn, Kowloon, Hong Kong, Peoples R China
[2] Natl Sun Yat Sen Univ, Dept Mat & Optoelect Sci, Kaohsiung 804, Taiwan
[3] Natl Cheng Kung Univ, Dept Mat Sci & Engn, Tainan 701, Taiwan
[4] Natl Cheng Kung Univ, Hierarch Green Energy Mat Hi GEM Res Ctr, Tainan 701, Taiwan
[5] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
来源：
ACTA MATERIALIA | 2020年 / 195卷
基金：
美国国家科学基金会;
关键词：
High entropy alloy; Solid solution alloy; Phase stability; Differential scanning calorimetry; Kinetics; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; PHASE-STABILITY; MICROSTRUCTURE; PRECIPITATION; CRMNFECONI; DIFFUSION; COCRFENI; DESIGN;
D O I：
10.1016/j.actamat.2020.05.015
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
There are overwhelming experimental observations indicating intermetallic (IM) phase formed in the intermediate temperatures in high entropy alloys. In this study, we proposed a model to show how kinetics could intervene the thermodynamic determination of phase formation. The model offers a good explanation for the prevalent formation of IM formation in the intermediate temperature range in high entropy alloys available in the literature. To further demonstrate the kinetic effect, we selected the equiatomic CrMnFeCoNi alloy (i.e., Cantor Alloy) as a surrogate material and employed differential scanning calorimetry (DSC) at different heating rates to investigate IM formation in this alloy. In this case, we found the presence of four IM compounds, BCC-Cr, L1(0)-NiMn, B2-FeCo, and Cr-rich sigma phases, in the temperature ranging from about 200 to 900 degrees C, above which the alloy was a complete solid solution. From the DSC measurements, we were also able to build a quasi-equilibrium TTT diagram for Cantor Alloy. It was the first time that such a TTT diagram was established for a high entropy alloy. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：71 / 80
页数：10
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