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Group precipitation and age hardening of nanostructured Fe-based alloys with ultra-high strengths

The precipitation of nanoparticles plays a key role in determining the properties of many structural materials, and the understanding of their formation and stabilization mechanisms has been a long standing interest in the material field. However, the critical issues involving the group precipitatio...

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Autores principales: Jiao, Z. B., Luan, J. H., Miller, M. K., Yu, C. Y., Liu, C. T.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4759528/
https://www.ncbi.nlm.nih.gov/pubmed/26892834
http://dx.doi.org/10.1038/srep21364
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author Jiao, Z. B.
Luan, J. H.
Miller, M. K.
Yu, C. Y.
Liu, C. T.
author_facet Jiao, Z. B.
Luan, J. H.
Miller, M. K.
Yu, C. Y.
Liu, C. T.
author_sort Jiao, Z. B.
collection PubMed
description The precipitation of nanoparticles plays a key role in determining the properties of many structural materials, and the understanding of their formation and stabilization mechanisms has been a long standing interest in the material field. However, the critical issues involving the group precipitation of various nanoparticles and their cooperative hardening mechanism remain elusive in the newly discovered Fe-based alloys with nanostructures. Here we quantitatively elucidate the nucleation mechanism, evolution kinetics and hardening effects of the group-precipitated nanoparticles in the Fe-Cu-Ni-Al-based alloys by atom probe tomography together with both first-principles and thermodynamic calculations. Our results provide the compelling evidence for two interesting but complex group precipitation pathways of nanoparticles, i.e., the Cu-rich and NiAl-based precipitations. The co-existence of the two precipitation pathways plays a key role in age hardening kinetics and ultimately enhances the hardening response, as compared to the single particle type of strengthening, therefore providing an effective new approach for strengthening materials for structural applications.
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spelling pubmed-47595282016-02-26 Group precipitation and age hardening of nanostructured Fe-based alloys with ultra-high strengths Jiao, Z. B. Luan, J. H. Miller, M. K. Yu, C. Y. Liu, C. T. Sci Rep Article The precipitation of nanoparticles plays a key role in determining the properties of many structural materials, and the understanding of their formation and stabilization mechanisms has been a long standing interest in the material field. However, the critical issues involving the group precipitation of various nanoparticles and their cooperative hardening mechanism remain elusive in the newly discovered Fe-based alloys with nanostructures. Here we quantitatively elucidate the nucleation mechanism, evolution kinetics and hardening effects of the group-precipitated nanoparticles in the Fe-Cu-Ni-Al-based alloys by atom probe tomography together with both first-principles and thermodynamic calculations. Our results provide the compelling evidence for two interesting but complex group precipitation pathways of nanoparticles, i.e., the Cu-rich and NiAl-based precipitations. The co-existence of the two precipitation pathways plays a key role in age hardening kinetics and ultimately enhances the hardening response, as compared to the single particle type of strengthening, therefore providing an effective new approach for strengthening materials for structural applications. Nature Publishing Group 2016-02-19 /pmc/articles/PMC4759528/ /pubmed/26892834 http://dx.doi.org/10.1038/srep21364 Text en Copyright © 2016, Macmillan Publishers Limited 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 to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Jiao, Z. B.
Luan, J. H.
Miller, M. K.
Yu, C. Y.
Liu, C. T.
Group precipitation and age hardening of nanostructured Fe-based alloys with ultra-high strengths
title Group precipitation and age hardening of nanostructured Fe-based alloys with ultra-high strengths
title_full Group precipitation and age hardening of nanostructured Fe-based alloys with ultra-high strengths
title_fullStr Group precipitation and age hardening of nanostructured Fe-based alloys with ultra-high strengths
title_full_unstemmed Group precipitation and age hardening of nanostructured Fe-based alloys with ultra-high strengths
title_short Group precipitation and age hardening of nanostructured Fe-based alloys with ultra-high strengths
title_sort group precipitation and age hardening of nanostructured fe-based alloys with ultra-high strengths
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4759528/
https://www.ncbi.nlm.nih.gov/pubmed/26892834
http://dx.doi.org/10.1038/srep21364
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