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Local Deformation Behavior of the Copper Harmonic Structure near Grain Boundaries Investigated through Nanoindentation
The copper harmonic structure, which consists of a coarse-grained “core” surrounded by a three-dimensional continuously connected fine-grained “shell,” exhibits both high ductility and high strength. In the present study, dislocation interactions at the shell–core boundary in the copper harmonic str...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8510059/ https://www.ncbi.nlm.nih.gov/pubmed/34640060 http://dx.doi.org/10.3390/ma14195663 |
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author | Paul, Viola Wakeda, Masato Ameyama, Kei Ota-Kawabata, Mie Ohmura, Takahito |
author_facet | Paul, Viola Wakeda, Masato Ameyama, Kei Ota-Kawabata, Mie Ohmura, Takahito |
author_sort | Paul, Viola |
collection | PubMed |
description | The copper harmonic structure, which consists of a coarse-grained “core” surrounded by a three-dimensional continuously connected fine-grained “shell,” exhibits both high ductility and high strength. In the present study, dislocation interactions at the shell–core boundary in the copper harmonic structure were directly measured using nanoindentation and microstructural observations via kernel average misorientation (KAM) to further understand the reason for its excellent mechanical properties. KAM analysis showed that the dislocation density in the vicinity of the shell–core boundary within the core region gradually increases with increasing plastic strain. The variation in the nanohardness exactly corresponds to the KAM, indicating that the higher strength is primarily caused by the higher dislocation density. The critical load for nanoindentation-induced plasticity initiation was lower at the shell–core boundary than at the core–core boundary, indicating a higher potency of dislocation emission at the shell–core boundary. Because dislocation–dislocation interactions are one of the major causes of the increase in the flow stress leading to higher strain hardening rates during deformation, the excellent balance between strength and ductility is attributed to the higher potency of dislocation emission at the shell–core boundary. |
format | Online Article Text |
id | pubmed-8510059 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-85100592021-10-13 Local Deformation Behavior of the Copper Harmonic Structure near Grain Boundaries Investigated through Nanoindentation Paul, Viola Wakeda, Masato Ameyama, Kei Ota-Kawabata, Mie Ohmura, Takahito Materials (Basel) Communication The copper harmonic structure, which consists of a coarse-grained “core” surrounded by a three-dimensional continuously connected fine-grained “shell,” exhibits both high ductility and high strength. In the present study, dislocation interactions at the shell–core boundary in the copper harmonic structure were directly measured using nanoindentation and microstructural observations via kernel average misorientation (KAM) to further understand the reason for its excellent mechanical properties. KAM analysis showed that the dislocation density in the vicinity of the shell–core boundary within the core region gradually increases with increasing plastic strain. The variation in the nanohardness exactly corresponds to the KAM, indicating that the higher strength is primarily caused by the higher dislocation density. The critical load for nanoindentation-induced plasticity initiation was lower at the shell–core boundary than at the core–core boundary, indicating a higher potency of dislocation emission at the shell–core boundary. Because dislocation–dislocation interactions are one of the major causes of the increase in the flow stress leading to higher strain hardening rates during deformation, the excellent balance between strength and ductility is attributed to the higher potency of dislocation emission at the shell–core boundary. MDPI 2021-09-29 /pmc/articles/PMC8510059/ /pubmed/34640060 http://dx.doi.org/10.3390/ma14195663 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Communication Paul, Viola Wakeda, Masato Ameyama, Kei Ota-Kawabata, Mie Ohmura, Takahito Local Deformation Behavior of the Copper Harmonic Structure near Grain Boundaries Investigated through Nanoindentation |
title | Local Deformation Behavior of the Copper Harmonic Structure near Grain Boundaries Investigated through Nanoindentation |
title_full | Local Deformation Behavior of the Copper Harmonic Structure near Grain Boundaries Investigated through Nanoindentation |
title_fullStr | Local Deformation Behavior of the Copper Harmonic Structure near Grain Boundaries Investigated through Nanoindentation |
title_full_unstemmed | Local Deformation Behavior of the Copper Harmonic Structure near Grain Boundaries Investigated through Nanoindentation |
title_short | Local Deformation Behavior of the Copper Harmonic Structure near Grain Boundaries Investigated through Nanoindentation |
title_sort | local deformation behavior of the copper harmonic structure near grain boundaries investigated through nanoindentation |
topic | Communication |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8510059/ https://www.ncbi.nlm.nih.gov/pubmed/34640060 http://dx.doi.org/10.3390/ma14195663 |
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