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Nanoscale Phase Evolution during Continuum Decomposition of Fe-Cr Alloys
The continuum decomposition of the Fe-Cr alloys from initial phase separation to steady-state coarsening with concentrations varying from 25 at % Cr and 30 at % Cr to 33 at % Cr aged at 750 K was studied by utilizing three-dimensional phase-field simulations. The dynamic stages of separation of nano...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5744366/ https://www.ncbi.nlm.nih.gov/pubmed/29244773 http://dx.doi.org/10.3390/ma10121431 |
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author | Li, Yongsheng Zhu, Lihui Liu, Chengwei Shi, Shujing |
author_facet | Li, Yongsheng Zhu, Lihui Liu, Chengwei Shi, Shujing |
author_sort | Li, Yongsheng |
collection | PubMed |
description | The continuum decomposition of the Fe-Cr alloys from initial phase separation to steady-state coarsening with concentrations varying from 25 at % Cr and 30 at % Cr to 33 at % Cr aged at 750 K was studied by utilizing three-dimensional phase-field simulations. The dynamic stages of separation of nanoscale Cr-enriched α′ phase were distinguished by the evolution of the volume fraction, particle number density and the average particle radius of the α′ phase. The stage of steady-state coarsening was characterized with an equilibrium volume fraction and decreasing particle number density. The coarsening rate constant by linear fitting of the cube of average radius and aging time shows an increase with the increasing Cr concentration. The time exponents decrease from the growth and coarsening stage to the steady-state coarsening stage and show a dependence on the particles number density at different concentrations. The quantitative evolutions of α′ phase via nucleation growth and spinodal decomposition are theoretically helpful for understanding the microstructure evolution with aging time in Fe-Cr alloys. |
format | Online Article Text |
id | pubmed-5744366 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-57443662017-12-31 Nanoscale Phase Evolution during Continuum Decomposition of Fe-Cr Alloys Li, Yongsheng Zhu, Lihui Liu, Chengwei Shi, Shujing Materials (Basel) Article The continuum decomposition of the Fe-Cr alloys from initial phase separation to steady-state coarsening with concentrations varying from 25 at % Cr and 30 at % Cr to 33 at % Cr aged at 750 K was studied by utilizing three-dimensional phase-field simulations. The dynamic stages of separation of nanoscale Cr-enriched α′ phase were distinguished by the evolution of the volume fraction, particle number density and the average particle radius of the α′ phase. The stage of steady-state coarsening was characterized with an equilibrium volume fraction and decreasing particle number density. The coarsening rate constant by linear fitting of the cube of average radius and aging time shows an increase with the increasing Cr concentration. The time exponents decrease from the growth and coarsening stage to the steady-state coarsening stage and show a dependence on the particles number density at different concentrations. The quantitative evolutions of α′ phase via nucleation growth and spinodal decomposition are theoretically helpful for understanding the microstructure evolution with aging time in Fe-Cr alloys. MDPI 2017-12-15 /pmc/articles/PMC5744366/ /pubmed/29244773 http://dx.doi.org/10.3390/ma10121431 Text en © 2017 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Li, Yongsheng Zhu, Lihui Liu, Chengwei Shi, Shujing Nanoscale Phase Evolution during Continuum Decomposition of Fe-Cr Alloys |
title | Nanoscale Phase Evolution during Continuum Decomposition of Fe-Cr Alloys |
title_full | Nanoscale Phase Evolution during Continuum Decomposition of Fe-Cr Alloys |
title_fullStr | Nanoscale Phase Evolution during Continuum Decomposition of Fe-Cr Alloys |
title_full_unstemmed | Nanoscale Phase Evolution during Continuum Decomposition of Fe-Cr Alloys |
title_short | Nanoscale Phase Evolution during Continuum Decomposition of Fe-Cr Alloys |
title_sort | nanoscale phase evolution during continuum decomposition of fe-cr alloys |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5744366/ https://www.ncbi.nlm.nih.gov/pubmed/29244773 http://dx.doi.org/10.3390/ma10121431 |
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