Phase Transformation Kinetics of a FCC Al<sub>0.25</sub>CoCrFeNi High-Entropy Alloy during Isochronal Heating

The phase transformation kinetics of a face-centered-cubic (FCC) Al<sub>0.25</sub>CoCrFeNi 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 t...

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Main Authors: Jun Wang, Chen Wei, Haoxue Yang, Tong Guo, Tingting Xu, Jinshan Li
Format: Article
Language:English
Published: MDPI AG 2018-12-01
Series:Metals
Subjects:
Online Access:https://www.mdpi.com/2075-4701/8/12/1015
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author Jun Wang
Chen Wei
Haoxue Yang
Tong Guo
Tingting Xu
Jinshan Li
author_facet Jun Wang
Chen Wei
Haoxue Yang
Tong Guo
Tingting Xu
Jinshan Li
author_sort Jun Wang
collection DOAJ
description The phase transformation kinetics of a face-centered-cubic (FCC) Al<sub>0.25</sub>CoCrFeNi 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&#8315;Akahira&#8315;Sunose (KAS) and Johnson&#8315;Mehl&#8315;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 Al<sub>0.25</sub>CoCrFeNi 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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spelling doaj.art-13773c289b5d466086545954b8f0ef952022-12-22T02:04:06ZengMDPI AGMetals2075-47012018-12-01812101510.3390/met8121015met8121015Phase Transformation Kinetics of a FCC Al<sub>0.25</sub>CoCrFeNi High-Entropy Alloy during Isochronal HeatingJun Wang0Chen Wei1Haoxue Yang2Tong Guo3Tingting Xu4Jinshan Li5State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, ChinaThe phase transformation kinetics of a face-centered-cubic (FCC) Al<sub>0.25</sub>CoCrFeNi 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&#8315;Akahira&#8315;Sunose (KAS) and Johnson&#8315;Mehl&#8315;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 Al<sub>0.25</sub>CoCrFeNi 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.https://www.mdpi.com/2075-4701/8/12/1015high-entropy alloyphase transformationkineticsisochronal heating
spellingShingle Jun Wang
Chen Wei
Haoxue Yang
Tong Guo
Tingting Xu
Jinshan Li
Phase Transformation Kinetics of a FCC Al<sub>0.25</sub>CoCrFeNi High-Entropy Alloy during Isochronal Heating
Metals
high-entropy alloy
phase transformation
kinetics
isochronal heating
title Phase Transformation Kinetics of a FCC Al<sub>0.25</sub>CoCrFeNi High-Entropy Alloy during Isochronal Heating
title_full Phase Transformation Kinetics of a FCC Al<sub>0.25</sub>CoCrFeNi High-Entropy Alloy during Isochronal Heating
title_fullStr Phase Transformation Kinetics of a FCC Al<sub>0.25</sub>CoCrFeNi High-Entropy Alloy during Isochronal Heating
title_full_unstemmed Phase Transformation Kinetics of a FCC Al<sub>0.25</sub>CoCrFeNi High-Entropy Alloy during Isochronal Heating
title_short Phase Transformation Kinetics of a FCC Al<sub>0.25</sub>CoCrFeNi High-Entropy Alloy during Isochronal Heating
title_sort phase transformation kinetics of a fcc al sub 0 25 sub cocrfeni high entropy alloy during isochronal heating
topic high-entropy alloy
phase transformation
kinetics
isochronal heating
url https://www.mdpi.com/2075-4701/8/12/1015
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