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Distinguishing contributions of ceramic matrix and binder metal to the plasticity of nanocrystalline cermets

Using the typical WC–Co cemented carbide as an example, the interactions of dislocations within the ceramic matrix and the binder metal, as well as the possible cooperation and competition between the matrix and binder during deformation of the nanocrystalline cermets, were studied by molecular dyna...

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Autores principales: Ge, Xinru, Liu, Xuemei, Hou, Chao, Lu, Hao, Tang, Fawei, Meng, Xiangfei, Xu, Wenwu, Song, Xiaoyan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6949597/
https://www.ncbi.nlm.nih.gov/pubmed/31949903
http://dx.doi.org/10.1107/S2052252519015471
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author Ge, Xinru
Liu, Xuemei
Hou, Chao
Lu, Hao
Tang, Fawei
Meng, Xiangfei
Xu, Wenwu
Song, Xiaoyan
author_facet Ge, Xinru
Liu, Xuemei
Hou, Chao
Lu, Hao
Tang, Fawei
Meng, Xiangfei
Xu, Wenwu
Song, Xiaoyan
author_sort Ge, Xinru
collection PubMed
description Using the typical WC–Co cemented carbide as an example, the interactions of dislocations within the ceramic matrix and the binder metal, as well as the possible cooperation and competition between the matrix and binder during deformation of the nanocrystalline cermets, were studied by molecular dynamics simulations. It was found that at the same level of strain, the dislocations in Co have more complex configurations in the cermet with higher Co content. With loading, the ratio between mobile and sessile dislocations in Co becomes stable earlier in the high-Co cermet. The strain threshold for the nucleation of dislocations in WC increases with Co content. At the later stage of deformation, the growth rate of WC dislocation density increases more rapidly in the cermet with lower Co content, which exhibits an opposite tendency compared with Co dislocation density. The relative contribution of Co and WC to the plasticity of the cermet varies in the deformation process. With a low Co content, the density of WC dislocations becomes higher than that of Co dislocations at larger strains, indicating that WC may contribute more than Co to the plasticity of the nanocrystalline cermet at the final deformation stage. The findings in the present work will be applicable to a large variety of ceramic–metal composite materials.
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spelling pubmed-69495972020-01-16 Distinguishing contributions of ceramic matrix and binder metal to the plasticity of nanocrystalline cermets Ge, Xinru Liu, Xuemei Hou, Chao Lu, Hao Tang, Fawei Meng, Xiangfei Xu, Wenwu Song, Xiaoyan IUCrJ Research Papers Using the typical WC–Co cemented carbide as an example, the interactions of dislocations within the ceramic matrix and the binder metal, as well as the possible cooperation and competition between the matrix and binder during deformation of the nanocrystalline cermets, were studied by molecular dynamics simulations. It was found that at the same level of strain, the dislocations in Co have more complex configurations in the cermet with higher Co content. With loading, the ratio between mobile and sessile dislocations in Co becomes stable earlier in the high-Co cermet. The strain threshold for the nucleation of dislocations in WC increases with Co content. At the later stage of deformation, the growth rate of WC dislocation density increases more rapidly in the cermet with lower Co content, which exhibits an opposite tendency compared with Co dislocation density. The relative contribution of Co and WC to the plasticity of the cermet varies in the deformation process. With a low Co content, the density of WC dislocations becomes higher than that of Co dislocations at larger strains, indicating that WC may contribute more than Co to the plasticity of the nanocrystalline cermet at the final deformation stage. The findings in the present work will be applicable to a large variety of ceramic–metal composite materials. International Union of Crystallography 2020-01-01 /pmc/articles/PMC6949597/ /pubmed/31949903 http://dx.doi.org/10.1107/S2052252519015471 Text en © Ge et al. 2020 http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.http://creativecommons.org/licenses/by/4.0/
spellingShingle Research Papers
Ge, Xinru
Liu, Xuemei
Hou, Chao
Lu, Hao
Tang, Fawei
Meng, Xiangfei
Xu, Wenwu
Song, Xiaoyan
Distinguishing contributions of ceramic matrix and binder metal to the plasticity of nanocrystalline cermets
title Distinguishing contributions of ceramic matrix and binder metal to the plasticity of nanocrystalline cermets
title_full Distinguishing contributions of ceramic matrix and binder metal to the plasticity of nanocrystalline cermets
title_fullStr Distinguishing contributions of ceramic matrix and binder metal to the plasticity of nanocrystalline cermets
title_full_unstemmed Distinguishing contributions of ceramic matrix and binder metal to the plasticity of nanocrystalline cermets
title_short Distinguishing contributions of ceramic matrix and binder metal to the plasticity of nanocrystalline cermets
title_sort distinguishing contributions of ceramic matrix and binder metal to the plasticity of nanocrystalline cermets
topic Research Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6949597/
https://www.ncbi.nlm.nih.gov/pubmed/31949903
http://dx.doi.org/10.1107/S2052252519015471
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