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Orientation Relationships in Al(0.7)CoCrFeNi High-Entropy Alloy

A detailed microstructural evaluation was executed on the crystallographic texture as well as the mechanisms for nucleation, phase transformation, and grain growth in a Al(0.7)CoCrFeNi high-entropy alloy. The microstructure and crystallographic orientations were characterized by electron backscatter...

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Autores principales: de Jeer, Leo T.H., Ocelík, Václav, De Hosson, Jeff T.M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Cambridge University Press 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7282864/
https://www.ncbi.nlm.nih.gov/pubmed/28809133
http://dx.doi.org/10.1017/S1431927617012442
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author de Jeer, Leo T.H.
Ocelík, Václav
De Hosson, Jeff T.M.
author_facet de Jeer, Leo T.H.
Ocelík, Václav
De Hosson, Jeff T.M.
author_sort de Jeer, Leo T.H.
collection PubMed
description A detailed microstructural evaluation was executed on the crystallographic texture as well as the mechanisms for nucleation, phase transformation, and grain growth in a Al(0.7)CoCrFeNi high-entropy alloy. The microstructure and crystallographic orientations were characterized by electron backscatter diffraction, and the chemical composition variations by energy-dispersive X-ray spectroscopy. The cast Al(0.7)CoCrFeNi alloy started in the BCC phase and partially transformed into the FCC phase. It was found that the Pitsch orientation relationship (OR) dominates the nucleation mechanism of the FCC phase; however, deviations with respect to the Pitsch OR are observed and are attributed to the differently sized atoms forming an ordered B2 phase in the alloy causing lattice distortions. The dual phase BCC–FCC microstructure contains FCC Widmanstätten plates oriented parallel to the {110}(BCC) planes of the parent grain. It was found that the crystal orientation distribution after the BCC–FCC phase transformation is confined and is explained as a product of the governing mechanisms.
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spelling pubmed-72828642020-06-17 Orientation Relationships in Al(0.7)CoCrFeNi High-Entropy Alloy de Jeer, Leo T.H. Ocelík, Václav De Hosson, Jeff T.M. Microsc Microanal Materials Science Applications A detailed microstructural evaluation was executed on the crystallographic texture as well as the mechanisms for nucleation, phase transformation, and grain growth in a Al(0.7)CoCrFeNi high-entropy alloy. The microstructure and crystallographic orientations were characterized by electron backscatter diffraction, and the chemical composition variations by energy-dispersive X-ray spectroscopy. The cast Al(0.7)CoCrFeNi alloy started in the BCC phase and partially transformed into the FCC phase. It was found that the Pitsch orientation relationship (OR) dominates the nucleation mechanism of the FCC phase; however, deviations with respect to the Pitsch OR are observed and are attributed to the differently sized atoms forming an ordered B2 phase in the alloy causing lattice distortions. The dual phase BCC–FCC microstructure contains FCC Widmanstätten plates oriented parallel to the {110}(BCC) planes of the parent grain. It was found that the crystal orientation distribution after the BCC–FCC phase transformation is confined and is explained as a product of the governing mechanisms. Cambridge University Press 2017-08-15 2017-10 /pmc/articles/PMC7282864/ /pubmed/28809133 http://dx.doi.org/10.1017/S1431927617012442 Text en © Microscopy Society of America 2017 http://creativecommons.org/licenses/by/4.0/ This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Materials Science Applications
de Jeer, Leo T.H.
Ocelík, Václav
De Hosson, Jeff T.M.
Orientation Relationships in Al(0.7)CoCrFeNi High-Entropy Alloy
title Orientation Relationships in Al(0.7)CoCrFeNi High-Entropy Alloy
title_full Orientation Relationships in Al(0.7)CoCrFeNi High-Entropy Alloy
title_fullStr Orientation Relationships in Al(0.7)CoCrFeNi High-Entropy Alloy
title_full_unstemmed Orientation Relationships in Al(0.7)CoCrFeNi High-Entropy Alloy
title_short Orientation Relationships in Al(0.7)CoCrFeNi High-Entropy Alloy
title_sort orientation relationships in al(0.7)cocrfeni high-entropy alloy
topic Materials Science Applications
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7282864/
https://www.ncbi.nlm.nih.gov/pubmed/28809133
http://dx.doi.org/10.1017/S1431927617012442
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