Fracture Along Deformation Twin Boundary in Small‐Volume Fe 40 Mn 40 Co 10 Cr 10 High Entropy Alloy

High‐entropy alloys (HEAs) with extraordinary combination of strength, ductility, and toughness have drawn extensive attention in recent years. One of widely accepted explanations for the marked mechanical performance in bulk HEAs is due to the tendency of deformation twinning. Here, the authors per...

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Bibliographic Details
Published inAdvanced engineering materials Vol. 21; no. 5
Main Authors Wang, Ya‐Bo, Yang, Ping‐Jiong, Sun, Xun, Zhang, Hua‐Lei, Han, Wei‐Zhong
Format Journal Article
LanguageEnglish
Published 01.05.2019
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Summary:High‐entropy alloys (HEAs) with extraordinary combination of strength, ductility, and toughness have drawn extensive attention in recent years. One of widely accepted explanations for the marked mechanical performance in bulk HEAs is due to the tendency of deformation twinning. Here, the authors perform in situ tensile test on small‐volume non‐equiatomic Fe 40 Mn 40 Co 10 Cr 10 HEA single crystals, and find that deformation twinning is a typical intrinsic factor for accelerating fracture. Profuse needle‐like deformation twins are nucleated under loading, while their thickening is very difficult due to high twin boundary migration energy, thus nanoscale surface crack is easily produced, which triggers catastrophic fracture.
ISSN:1438-1656
1527-2648
DOI:10.1002/adem.201801266