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

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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.

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ACKNOWLEDGMENTS

We are grateful for the support of the National Science Foundation (DMR-1611180) and the Department of Energy (DOE) Office of Fossil Energy, NETL (DE-FE0008855, DE-FE-0024054, and DE-FE-0011194), with Dr. G. Shiflet, Dr. D. Farkas, Dr. V. Cedro, Dr. R. Dunt, Dr. S. Markovich, and Dr. J. Mullen as program managers. P.K.L. very much appreciates the support from the U.S. Army Office Project (W911NF-13-1-0438) with the program managers, Dr. M.P. Bakas, Dr. S.N. Mathaudhu, and Dr. D.M. Stepp.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee, 37996, USA

    Weidong Li & Peter K. Liaw

  2. Laboratory for Microstructures, Institute of Materials, Shanghai University, Shanghai, 200444, China

    Gang Wang & Shiwei Wu

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  1. Weidong Li
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  2. Gang Wang
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  3. Shiwei Wu
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  4. Peter K. Liaw
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Correspondence to Weidong Li or Peter K. Liaw.

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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/.

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Li, W., Wang, G., Wu, S. et al. Creep, fatigue, and fracture behavior of high-entropy alloys. Journal of Materials Research 33, 3011–3034 (2018). https://doi.org/10.1557/jmr.2018.191

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  • DOI: https://doi.org/10.1557/jmr.2018.191

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