Fracture resistance of high entropy alloys: A review

Li, Weidong; Liaw, Peter K.; Gao, Yanfei

doi:10.1016/j.intermet.2018.05.013

Title: Fracture resistance of high entropy alloys: A review

Journal Article · Tue May 29 00:00:00 EDT 2018 · Intermetallics

DOI:https://doi.org/10.1016/j.intermet.2018.05.013· OSTI ID:1543239

Li, Weidong ^[1]; Liaw, Peter K. ^[2]; Gao, Yanfei ^[3]

Wuhan Univ. of Technology, Wuhan (China); Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Fascinated by the exceptional mechanical properties of high entropy alloys (HEAs), unremitting endeavors are placed on accelerating their engineering applications in multiple critical fields. As all other structural materials, attaining sufficient fracture resistance is a vital requirement for HEAs, particularly for safety critical applications. Along this line, the fracture resistance of a number of HEAs and medium-entropy alloys (MEAs) had been studied in the past decade. While some exhibit unprecedented fracture toughness akin to the toughest materials ever known, others are just alike brittle materials. Herein, we summarize one decade of investigations of the fracture resistance of HEAs and MEAs, including the characterization of fracture toughness, disclosure of fractographic characteristics, and understanding of fracture micro-mechanisms. The role of alloy composition, temperature, phase constituent, and characterization techniques in altering the fracture toughness are discussed; characteristics of the cleavage and shear fractures are detailed; toughening and weakening mechanisms, from the atomic to the defect level, are reviewed. In conclusion, some key questions are raised, and the directions for future research are suggested.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1543239

Alternate ID(s):: OSTI ID: 1530646

Journal Information:: Intermetallics, Vol. 99, Issue C; ISSN 0966-9795

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 96 works

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