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Effect of Annealing Treatment on Mechanical Properties of Nanocrystalline α-iron: an Atomistic Study

Claims are often found in the literature that metallic materials can be nanocrystallized by severe plastic deformation (SPD). However, SPD does not generate a well-defined nanocrystalline (NC) material, which can be achieved by subsequent annealing/recovery treatment. In this study, molecular dynami...

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Detalles Bibliográficos
Autores principales: Tong, Xuhang, Zhang, Hao, Li, D. Y.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4327417/
https://www.ncbi.nlm.nih.gov/pubmed/25675978
http://dx.doi.org/10.1038/srep08459
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author Tong, Xuhang
Zhang, Hao
Li, D. Y.
author_facet Tong, Xuhang
Zhang, Hao
Li, D. Y.
author_sort Tong, Xuhang
collection PubMed
description Claims are often found in the literature that metallic materials can be nanocrystallized by severe plastic deformation (SPD). However, SPD does not generate a well-defined nanocrystalline (NC) material, which can be achieved by subsequent annealing/recovery treatment. In this study, molecular dynamics (MD) simulation is employed to study the effect of annealing on structure and mechanical properties of cyclic deformed NC α-iron, which simulates SPD-processed α-iron. It is demonstrated that grain boundaries in the deformed NC α-iron evolve to a more equilibrium state during annealing, eliminating or minimizing the residual stress. The annealing treatment increases the system's strength by reducing dislocation emission sources, and improves material ductility through strengthening grain boundaries' resistance to intergranular cracks. The results indicate that the annealing treatment is an essential process for obtaining a well-defined NC structure with superior mechanical properties.
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spelling pubmed-43274172015-02-23 Effect of Annealing Treatment on Mechanical Properties of Nanocrystalline α-iron: an Atomistic Study Tong, Xuhang Zhang, Hao Li, D. Y. Sci Rep Article Claims are often found in the literature that metallic materials can be nanocrystallized by severe plastic deformation (SPD). However, SPD does not generate a well-defined nanocrystalline (NC) material, which can be achieved by subsequent annealing/recovery treatment. In this study, molecular dynamics (MD) simulation is employed to study the effect of annealing on structure and mechanical properties of cyclic deformed NC α-iron, which simulates SPD-processed α-iron. It is demonstrated that grain boundaries in the deformed NC α-iron evolve to a more equilibrium state during annealing, eliminating or minimizing the residual stress. The annealing treatment increases the system's strength by reducing dislocation emission sources, and improves material ductility through strengthening grain boundaries' resistance to intergranular cracks. The results indicate that the annealing treatment is an essential process for obtaining a well-defined NC structure with superior mechanical properties. Nature Publishing Group 2015-02-13 /pmc/articles/PMC4327417/ /pubmed/25675978 http://dx.doi.org/10.1038/srep08459 Text en Copyright © 2015, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Tong, Xuhang
Zhang, Hao
Li, D. Y.
Effect of Annealing Treatment on Mechanical Properties of Nanocrystalline α-iron: an Atomistic Study
title Effect of Annealing Treatment on Mechanical Properties of Nanocrystalline α-iron: an Atomistic Study
title_full Effect of Annealing Treatment on Mechanical Properties of Nanocrystalline α-iron: an Atomistic Study
title_fullStr Effect of Annealing Treatment on Mechanical Properties of Nanocrystalline α-iron: an Atomistic Study
title_full_unstemmed Effect of Annealing Treatment on Mechanical Properties of Nanocrystalline α-iron: an Atomistic Study
title_short Effect of Annealing Treatment on Mechanical Properties of Nanocrystalline α-iron: an Atomistic Study
title_sort effect of annealing treatment on mechanical properties of nanocrystalline α-iron: an atomistic study
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4327417/
https://www.ncbi.nlm.nih.gov/pubmed/25675978
http://dx.doi.org/10.1038/srep08459
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