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Effect of Cold Rolling on the Phase Transformation Kinetics of an Al0.5CoCrFeNi High-Entropy Alloy

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
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Entropy 2018, 20(12), 917; https://doi.org/10.3390/e20120917
Received: 25 October 2018 / Revised: 27 November 2018 / Accepted: 29 November 2018 / Published: 30 November 2018
(This article belongs to the Special Issue New Advances in High-Entropy Alloys)
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Abstract

The solid state phase transformation kinetics of as-cast and cold rolling deformed Al0.5CoCrFeNi high-entropy alloys have been investigated by the thermal expansion method. The phase transformed volume fractions are determined from the thermal expansion curve using the lever rule method, and the deformed sample exhibits a much higher transformation rate. Two kinetic parameters, activation energy (E) and kinetic exponent (n) are determined using Kissinger– Akahira–Sunose (KAS) and Johnson–Mehl–Avrami (JMA) method, respectively. Results show that a pre-deformed sample shows a much lower activation energy and higher kinetic exponent compared with the as-cast sample, which are interpreted based on the deformation induced defects that can promote the nucleation and growth process during phase transformation. View Full-Text
Keywords: high-entropy alloy; phase transformation; kinetics; deformation; thermal expansion high-entropy alloy; phase transformation; kinetics; deformation; thermal expansion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wang, J.; Yang, H.; Guo, T.; Wang, J.; Wang, W.Y.; Li, J. Effect of Cold Rolling on the Phase Transformation Kinetics of an Al0.5CoCrFeNi High-Entropy Alloy. Entropy 2018, 20, 917.

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