Roles of the semisolid heating on the microstructure of a hypereutectic Al–Fe–Cu alloy

Abstract A hypereutectic Al–Fe–Cu alloy with a high-volume fraction ferro-aluminum second phase (AlFe phases for short) was reheated in the solid–liquid region and the microstructure evolution was investigated. During semisolid heating, the high-melting AlFe phases in the Al–Fe–Cu alloy were demonst...

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Autores principales:	Wei Wang, Bo Liu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0157cfffe0c34604b5bb2a043b4ecdc1
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spelling	oai:doaj.org-article:0157cfffe0c34604b5bb2a043b4ecdc12021-12-02T14:01:38ZRoles of the semisolid heating on the microstructure of a hypereutectic Al–Fe–Cu alloy10.1038/s41598-021-80983-52045-2322https://doaj.org/article/0157cfffe0c34604b5bb2a043b4ecdc12021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-80983-5https://doaj.org/toc/2045-2322Abstract A hypereutectic Al–Fe–Cu alloy with a high-volume fraction ferro-aluminum second phase (AlFe phases for short) was reheated in the solid–liquid region and the microstructure evolution was investigated. During semisolid heating, the high-melting AlFe phases in the Al–Fe–Cu alloy were demonstrated to stunt the grain growth and to block the liquid coalescing and the solid moving. Consequently, the grain sizes in the alloy increased rapidly and then slowly with increasing holding time, and the grains increased gradually with increasing temperature. Smaller grain grew into the large grain but it did not continually grow into the larger grain with increasing temperature or holding time. The shape factor (SF) of the alloy increased gradually and then decreased quickly with increasing temperature or holding time. The major alloying elements in addition to magnesium in the hypereutectic Al–Fe–Cu alloy were finally enriched at the grain boundaries or around the AlFe phases. Besides dissolving in the grains or AlFe phases, copper also diffused between the grains or around AlFe phases, resulting in the formation of diverse Cu-enriched zones. Cu constituents in the inter-grains are outnumbered in the intra-grains. The coarsening kinetics of the alloy was controlled by grain boundary diffusion. The coarsening rate constants K in the initial stage of heating (5–20 min) were several times larger than that in the later stage of heating (20–60 min), indicating the blocking effect of AlFe phases on coarsened grain being obvious.Wei WangBo LiuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Wei Wang Bo Liu Roles of the semisolid heating on the microstructure of a hypereutectic Al–Fe–Cu alloy
description	Abstract A hypereutectic Al–Fe–Cu alloy with a high-volume fraction ferro-aluminum second phase (AlFe phases for short) was reheated in the solid–liquid region and the microstructure evolution was investigated. During semisolid heating, the high-melting AlFe phases in the Al–Fe–Cu alloy were demonstrated to stunt the grain growth and to block the liquid coalescing and the solid moving. Consequently, the grain sizes in the alloy increased rapidly and then slowly with increasing holding time, and the grains increased gradually with increasing temperature. Smaller grain grew into the large grain but it did not continually grow into the larger grain with increasing temperature or holding time. The shape factor (SF) of the alloy increased gradually and then decreased quickly with increasing temperature or holding time. The major alloying elements in addition to magnesium in the hypereutectic Al–Fe–Cu alloy were finally enriched at the grain boundaries or around the AlFe phases. Besides dissolving in the grains or AlFe phases, copper also diffused between the grains or around AlFe phases, resulting in the formation of diverse Cu-enriched zones. Cu constituents in the inter-grains are outnumbered in the intra-grains. The coarsening kinetics of the alloy was controlled by grain boundary diffusion. The coarsening rate constants K in the initial stage of heating (5–20 min) were several times larger than that in the later stage of heating (20–60 min), indicating the blocking effect of AlFe phases on coarsened grain being obvious.
format	article
author	Wei Wang Bo Liu
author_facet	Wei Wang Bo Liu
author_sort	Wei Wang
title	Roles of the semisolid heating on the microstructure of a hypereutectic Al–Fe–Cu alloy
title_short	Roles of the semisolid heating on the microstructure of a hypereutectic Al–Fe–Cu alloy
title_full	Roles of the semisolid heating on the microstructure of a hypereutectic Al–Fe–Cu alloy
title_fullStr	Roles of the semisolid heating on the microstructure of a hypereutectic Al–Fe–Cu alloy
title_full_unstemmed	Roles of the semisolid heating on the microstructure of a hypereutectic Al–Fe–Cu alloy
title_sort	roles of the semisolid heating on the microstructure of a hypereutectic al–fe–cu alloy
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/0157cfffe0c34604b5bb2a043b4ecdc1
work_keys_str_mv	AT weiwang rolesofthesemisolidheatingonthemicrostructureofahypereutecticalfecualloy AT boliu rolesofthesemisolidheatingonthemicrostructureofahypereutecticalfecualloy
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Roles of the semisolid heating on the microstructure of a hypereutectic Al–Fe–Cu alloy

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