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Strengthening mechanisms in high-entropy alloys: Perspectives for alloy design

Published online by Cambridge University Press:  12 October 2018

Pedro E.J. Rivera-Díaz-del-Castillo  and
Hanwei Fu
Pedro E.J. Rivera-Díaz-del-Castillo*
Affiliation:
Department of Engineering, Lancaster University, LA1 4YW Lancaster, U.K.
Hanwei Fu
Affiliation:
Department of Engineering, Lancaster University, LA1 4YW Lancaster, U.K.
*
a)Address all correspondence to this author. e-mail: p.rivera1@lancaster.ac.uk
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Abstract

High-entropy alloys (HEAs), originally introduced to the literature due to their ability to stabilize a single phase across large temperature ranges, have recently demonstrated to display multiphase systems undergoing a variety of strengthening mechanisms. Previous reports have focused on solid solution strengthening and precipitation hardening; however, other hardening mechanisms such as twinning and martensite formation have been reported to play a key role in controlling their mechanical behavior. Such deformation mechanisms display significant variations with temperature and strain rate. The present contribution provides an outline of the various hardening mechanisms reported in the literature for HEAs. For each mechanism, a modeling strategy is proposed to describe the associated mechanical behavior. The mechanisms are combined into a single framework to discover new HEAs of improved mechanical behavior. A strategy for HEA design is presented, and the advantages of adopting additive layer manufacturing to improve mechanical behavior are discussed.

Keywords

alloystrengthmicrostructure
Type
Invited Review
Information
Journal of Materials Research , Volume 33 , Issue 19: Focus Issue: Fundamental Understanding and Applications of High-Entropy Alloys , 14 October 2018 , pp. 2970 - 2982
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

This section of Journal of Materials Research is reserved for papers that are reviews of literature in a given area.

References

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