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Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals
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 th...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7801446/ https://www.ncbi.nlm.nih.gov/pubmed/33431909 http://dx.doi.org/10.1038/s41598-020-77487-z |
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author | Lee, Hyunsoo Shabani, Mitra Pataky, Garrett J. Abdeljawad, Fadi |
author_facet | Lee, Hyunsoo Shabani, Mitra Pataky, Garrett J. Abdeljawad, Fadi |
author_sort | Lee, Hyunsoo |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-7801446 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-78014462021-01-12 Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals Lee, Hyunsoo Shabani, Mitra Pataky, Garrett J. Abdeljawad, Fadi Sci Rep Article 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. Nature Publishing Group UK 2021-01-11 /pmc/articles/PMC7801446/ /pubmed/33431909 http://dx.doi.org/10.1038/s41598-020-77487-z Text en © The Author(s) 2021 Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Lee, Hyunsoo Shabani, Mitra Pataky, Garrett J. Abdeljawad, Fadi Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals |
title | Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals |
title_full | Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals |
title_fullStr | Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals |
title_full_unstemmed | Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals |
title_short | Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals |
title_sort | tensile deformation behavior of twist grain boundaries in cocrfemnni high entropy alloy bicrystals |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7801446/ https://www.ncbi.nlm.nih.gov/pubmed/33431909 http://dx.doi.org/10.1038/s41598-020-77487-z |
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