Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals.
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
11 Jan 2021
11 Jan 2021
Historique:
received:
25
09
2020
accepted:
04
11
2020
entrez:
12
1
2021
pubmed:
13
1
2021
medline:
13
1
2021
Statut:
epublish
Résumé
High entropy alloys (HEA) are a class of materials that consist of multiple elemental species in similar concentrations. The use of elements in far from dilute concentrations introduces a multi-dimensional composition design space by which the properties of metallic systems can be tailored. While the mechanical behavior of HEAs has been the subject of active research recently, the role of grain boundaries (GBs) in their deformation behavior remains poorly understood. Motivated by recent experiments on HEAs demonstrating that GBs act as nucleation sites for deformation twins, herein, we leverage atomistic simulations to construct a series of equiatomic CoCrFeMnNi HEA bicrystals with [Formula: see text] and [Formula: see text] symmetric twist GBs and examine their tensile behavior and underlying deformation mechanisms at 77 K. Simulation results reveal that plastic deformation proceeds by the nucleation of partial dislocations from GBs, which then grow with further loading by bowing into the bulk crystals leaving behind stacking faults. Variations in the nucleation stress exist as function of GB character, defined in this work by the twist angle. Our results provide future avenues to explore GBs as a microstructure design tool to develop HEAs with tailored properties.
Identifiants
pubmed: 33431909
doi: 10.1038/s41598-020-77487-z
pii: 10.1038/s41598-020-77487-z
pmc: PMC7801446
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
428Références
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