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Nano-sized precipitate stability and its controlling factors in a NiAl-strengthened ferritic alloy

Coherent B2-ordered NiAl-type precipitates have been used to reinforce solid-solution body-centered-cubic iron for high-temperature application in fossil-energy power plants. In this study, we investigate the stability of nano-sized precipitates in a NiAl-strengthened ferritic alloy at 700–950 °C us...

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Autores principales: Sun, Zhiqian, Song, Gian, Ilavsky, Jan, Ghosh, Gautam, Liaw, Peter K.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4633603/
https://www.ncbi.nlm.nih.gov/pubmed/26537060
http://dx.doi.org/10.1038/srep16081
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author Sun, Zhiqian
Song, Gian
Ilavsky, Jan
Ghosh, Gautam
Liaw, Peter K.
author_facet Sun, Zhiqian
Song, Gian
Ilavsky, Jan
Ghosh, Gautam
Liaw, Peter K.
author_sort Sun, Zhiqian
collection PubMed
description Coherent B2-ordered NiAl-type precipitates have been used to reinforce solid-solution body-centered-cubic iron for high-temperature application in fossil-energy power plants. In this study, we investigate the stability of nano-sized precipitates in a NiAl-strengthened ferritic alloy at 700–950 °C using ultra-small angle X-ray scattering and electron microscopies. Here we show that the coarsening kinetics of NiAl-type precipitates is in excellent agreement with the ripening model in multicomponent alloys. We further demonstrate that the interfacial energy between the matrix and NiAl-type precipitates is strongly dependent on differences in the matrix/precipitate compositions. Our results profile the ripening process in multicomponent alloys by illustrating controlling factors of interfacial energy, diffusivities, and element partitioning. The study provides guidelines to design and develop high-temperature alloys with stable microstructures for long-term service.
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spelling pubmed-46336032015-11-05 Nano-sized precipitate stability and its controlling factors in a NiAl-strengthened ferritic alloy Sun, Zhiqian Song, Gian Ilavsky, Jan Ghosh, Gautam Liaw, Peter K. Sci Rep Article Coherent B2-ordered NiAl-type precipitates have been used to reinforce solid-solution body-centered-cubic iron for high-temperature application in fossil-energy power plants. In this study, we investigate the stability of nano-sized precipitates in a NiAl-strengthened ferritic alloy at 700–950 °C using ultra-small angle X-ray scattering and electron microscopies. Here we show that the coarsening kinetics of NiAl-type precipitates is in excellent agreement with the ripening model in multicomponent alloys. We further demonstrate that the interfacial energy between the matrix and NiAl-type precipitates is strongly dependent on differences in the matrix/precipitate compositions. Our results profile the ripening process in multicomponent alloys by illustrating controlling factors of interfacial energy, diffusivities, and element partitioning. The study provides guidelines to design and develop high-temperature alloys with stable microstructures for long-term service. Nature Publishing Group 2015-11-05 /pmc/articles/PMC4633603/ /pubmed/26537060 http://dx.doi.org/10.1038/srep16081 Text en Copyright © 2015, 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
Sun, Zhiqian
Song, Gian
Ilavsky, Jan
Ghosh, Gautam
Liaw, Peter K.
Nano-sized precipitate stability and its controlling factors in a NiAl-strengthened ferritic alloy
title Nano-sized precipitate stability and its controlling factors in a NiAl-strengthened ferritic alloy
title_full Nano-sized precipitate stability and its controlling factors in a NiAl-strengthened ferritic alloy
title_fullStr Nano-sized precipitate stability and its controlling factors in a NiAl-strengthened ferritic alloy
title_full_unstemmed Nano-sized precipitate stability and its controlling factors in a NiAl-strengthened ferritic alloy
title_short Nano-sized precipitate stability and its controlling factors in a NiAl-strengthened ferritic alloy
title_sort nano-sized precipitate stability and its controlling factors in a nial-strengthened ferritic alloy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4633603/
https://www.ncbi.nlm.nih.gov/pubmed/26537060
http://dx.doi.org/10.1038/srep16081
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