Phase Transformation Kinetics of a FCC Al0.25CoCrFeNi High-Entropy Alloy during Isochronal Heating

被引：4
作者：
Wang, Jun [1 ]
Wei, Chen [1 ]
Yang, Haoxue [1 ]
Guo, Tong [1 ]
Xu, Tingting [1 ]
Li, Jinshan [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
METALS | 2018年 / 8卷 / 12期
关键词：
high-entropy alloy; phase transformation; kinetics; isochronal heating; MECHANICAL-PROPERTIES; IN-SITU; MICROSTRUCTURE; EVOLUTION; DESIGN;
D O I：
10.3390/met8121015
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The phase transformation kinetics of a face-centered-cubic (FCC) Al0.25CoCrFeNi high-entropy alloy during isochronal heating is investigated by thermal dilation experiment. The phase transformed volume fraction is determined from the thermal expansion curve, and results show that the phase transition is controlled by diffusion controlled nucleation-growth mechanism. The kinetic parameters, activation energy and kinetic exponent are determined based on Kissinger- Akahira-Sunose (KAS) and Johnson-Mehl-Avrami (JMA) method, respectively. The activation energy and kinetic exponent determined are almost constant, indicating a stable and slow speed of phase transition in the FCC Al0.25CoCrFeNi high-entropy alloy. During the main transformation process, the kinetic exponent shows that the phase transition is diffusion controlled process without nucleation during the transformation.
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页数：9
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