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Creep, fatigue, and fracture behavior of high-entropy alloys

Published online by Cambridge University Press:  10 July 2018

Weidong Li ,
Gang Wang ,
Shiwei Wu  and
Peter K. Liaw
Weidong Li*
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996, USA
Gang Wang
Affiliation:
Laboratory for Microstructures, Institute of Materials, Shanghai University, Shanghai 200444, China
Shiwei Wu
Affiliation:
Laboratory for Microstructures, Institute of Materials, Shanghai University, Shanghai 200444, China
Peter K. Liaw*
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996, USA
*
a)Address all correspondence to these authors. e-mail: lei432378yu@gmail.com
b)e-mail: pliaw@utk.edu
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Abstract

As high-entropy alloys (HEAs) are being actively explored for next-generation structural materials, gaining a comprehensive understanding of their creep, fatigue, and fracture behaviors is indispensable. These three aspects of mechanical properties are particularly important because (i) creep resistance dictates an alloy’s high-temperature applications; (ii) fatigue failure is the most frequently encountered failure mode in the service life of a material; (iii) fracture is the very last step that a material loses its load-carrying capability. In consideration of their importance in designing HEAs toward applicable structural materials, this article offers a comprehensive review on what has been accomplished so far in these three topics. The sub-topics covered include a comparison of different creep testing methods, creep-parameter extraction, creep mechanism, high-cycle fatigue S–N relation, fatigue-crack-growth behavior, fracture toughness, fracture under different loading conditions, and fractography. Directions for future efforts are suggested in the end.

Keywords

creep mechanismstress exponentendurance limitfracture toughnessfracture mechanism
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. 3011 - 3034
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

c)

This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/editor-manuscripts/.

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

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