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Review

A Review of the Serrated-Flow Phenomenon and Its Role in the Deformation Behavior of High-Entropy Alloys

by
Jamieson Brechtl
1,
Shuying Chen
2,
Chanho Lee
2,
Yunzhu Shi
3,
Rui Feng
2,
Xie Xie
2,
David Hamblin
2,
Anne M. Coleman
2,
Bradley Straka
2,
Hugh Shortt
2,
R. Jackson Spurling
2 and
Peter K. Liaw
2,*
1
The Bredesen Center for Interdisciplinary Research and Graduate Education, The University of Tennessee, Knoxville, TN 37996, USA
2
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA
3
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Metals 2020, 10(8), 1101; https://doi.org/10.3390/met10081101
Submission received: 10 July 2020 / Revised: 6 August 2020 / Accepted: 11 August 2020 / Published: 13 August 2020
(This article belongs to the Special Issue Complex Concentrated Alloys (CCAs) - Current Understanding and Future Opportunities)
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Abstract

High-entropy alloys (HEAs) are a novel class of alloys that have many desirable properties. The serrated flow that occurs in high-entropy alloys during mechanical deformation is an important phenomenon since it can lead to significant changes in the microstructure of the alloy. In this article, we review the recent findings on the serration behavior in a variety of high-entropy alloys. Relationships among the serrated flow behavior, composition, microstructure, and testing condition are explored. Importantly, the mechanical-testing type (compression/tension), testing temperature, applied strain rate, and serration type for certain high-entropy alloys are summarized. The literature reveals that the serrated flow can be affected by experimental conditions such as the strain rate and test temperature. Furthermore, this type of phenomenon has been successfully modeled and analyzed, using several different types of analytical methods, including the mean-field theory formalism and the complexity-analysis technique. Importantly, the results of the analyses show that the serrated flow in HEAs consists of complex dynamical behavior. It is anticipated that this review will provide some useful and clarifying information regarding the serrated-flow mechanisms in this material system. Finally, suggestions for future research directions in this field are proposed, such as the effects of irradiation, additives (such as C and Al), the presence of nanoparticles, and twinning on the serrated flow behavior in HEAs.
Keywords: high-entropy alloys; serrated flow; microstructure; data analysis high-entropy alloys; serrated flow; microstructure; data analysis

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MDPI and ACS Style

Brechtl, J.; Chen, S.; Lee, C.; Shi, Y.; Feng, R.; Xie, X.; Hamblin, D.; Coleman, A.M.; Straka, B.; Shortt, H.; et al. A Review of the Serrated-Flow Phenomenon and Its Role in the Deformation Behavior of High-Entropy Alloys. Metals 2020, 10, 1101. https://doi.org/10.3390/met10081101

AMA Style

Brechtl J, Chen S, Lee C, Shi Y, Feng R, Xie X, Hamblin D, Coleman AM, Straka B, Shortt H, et al. A Review of the Serrated-Flow Phenomenon and Its Role in the Deformation Behavior of High-Entropy Alloys. Metals. 2020; 10(8):1101. https://doi.org/10.3390/met10081101

Chicago/Turabian Style

Brechtl, Jamieson, Shuying Chen, Chanho Lee, Yunzhu Shi, Rui Feng, Xie Xie, David Hamblin, Anne M. Coleman, Bradley Straka, Hugh Shortt, and et al. 2020. "A Review of the Serrated-Flow Phenomenon and Its Role in the Deformation Behavior of High-Entropy Alloys" Metals 10, no. 8: 1101. https://doi.org/10.3390/met10081101

APA Style

Brechtl, J., Chen, S., Lee, C., Shi, Y., Feng, R., Xie, X., Hamblin, D., Coleman, A. M., Straka, B., Shortt, H., Spurling, R. J., & Liaw, P. K. (2020). A Review of the Serrated-Flow Phenomenon and Its Role in the Deformation Behavior of High-Entropy Alloys. Metals, 10(8), 1101. https://doi.org/10.3390/met10081101

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