Eutectic modification by ternary compound cluster formation in Al-Si alloys

Abstract Al-alloys with Si as the main alloying element constitute the vast majority of Al castings used commercially today. The eutectic Si microstructure in these alloys can be modified from plate-like to coral-like by the addition of a small amount of a third element to improve ductility and toug...

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Autores principales:	J. Barrirero, C. Pauly, M. Engstler, J. Ghanbaja, N. Ghafoor, J. Li, P. Schumacher, M. Odén, F. Mücklich
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2019
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/8b415f055d414484b037be31e4da09e7
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spelling	oai:doaj.org-article:8b415f055d414484b037be31e4da09e72021-12-02T15:08:32ZEutectic modification by ternary compound cluster formation in Al-Si alloys10.1038/s41598-019-41919-22045-2322https://doaj.org/article/8b415f055d414484b037be31e4da09e72019-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-41919-2https://doaj.org/toc/2045-2322Abstract Al-alloys with Si as the main alloying element constitute the vast majority of Al castings used commercially today. The eutectic Si microstructure in these alloys can be modified from plate-like to coral-like by the addition of a small amount of a third element to improve ductility and toughness. In this investigation the effects of Eu and Yb are studied and their influence on the microstructure is compared to further understand this modification. The two elements impact the alloy differently, where Eu modifies Si into a coral-like structure while Yb does not. Atom probe tomography shows that Eu is present within the Si phase in the form of ternary compound Al2Si2Eu clusters, while Yb is absent in the Si phase. This indicates that the presence of ternary compound clusters within Si is a necessary condition for the formation of a coral-like structure. A crystallographic orientation relationship between Si and the Al2Si2Eu phase was found, where the following plane normals are parallel: 011Si//0001Al2Si2Eu, 111Si//6$$\bar{7}$$ 7¯ 10Al2Si2Eu and 011Si//6$$\bar{7}$$ 7¯ 10Al2Si2Eu. No crystallographic relationship was found between Si and Al2Si2Yb. The heterogeneous formation of coherent Al2Si2Eu clusters inside the Si-phase is suggested to trigger the modification of the microstructure.J. BarrireroC. PaulyM. EngstlerJ. GhanbajaN. GhafoorJ. LiP. SchumacherM. OdénF. MücklichNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-10 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q J. Barrirero C. Pauly M. Engstler J. Ghanbaja N. Ghafoor J. Li P. Schumacher M. Odén F. Mücklich Eutectic modification by ternary compound cluster formation in Al-Si alloys
description	Abstract Al-alloys with Si as the main alloying element constitute the vast majority of Al castings used commercially today. The eutectic Si microstructure in these alloys can be modified from plate-like to coral-like by the addition of a small amount of a third element to improve ductility and toughness. In this investigation the effects of Eu and Yb are studied and their influence on the microstructure is compared to further understand this modification. The two elements impact the alloy differently, where Eu modifies Si into a coral-like structure while Yb does not. Atom probe tomography shows that Eu is present within the Si phase in the form of ternary compound Al2Si2Eu clusters, while Yb is absent in the Si phase. This indicates that the presence of ternary compound clusters within Si is a necessary condition for the formation of a coral-like structure. A crystallographic orientation relationship between Si and the Al2Si2Eu phase was found, where the following plane normals are parallel: 011Si//0001Al2Si2Eu, 111Si//6$$\bar{7}$$ 7¯ 10Al2Si2Eu and 011Si//6$$\bar{7}$$ 7¯ 10Al2Si2Eu. No crystallographic relationship was found between Si and Al2Si2Yb. The heterogeneous formation of coherent Al2Si2Eu clusters inside the Si-phase is suggested to trigger the modification of the microstructure.
format	article
author	J. Barrirero C. Pauly M. Engstler J. Ghanbaja N. Ghafoor J. Li P. Schumacher M. Odén F. Mücklich
author_facet	J. Barrirero C. Pauly M. Engstler J. Ghanbaja N. Ghafoor J. Li P. Schumacher M. Odén F. Mücklich
author_sort	J. Barrirero
title	Eutectic modification by ternary compound cluster formation in Al-Si alloys
title_short	Eutectic modification by ternary compound cluster formation in Al-Si alloys
title_full	Eutectic modification by ternary compound cluster formation in Al-Si alloys
title_fullStr	Eutectic modification by ternary compound cluster formation in Al-Si alloys
title_full_unstemmed	Eutectic modification by ternary compound cluster formation in Al-Si alloys
title_sort	eutectic modification by ternary compound cluster formation in al-si alloys
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/8b415f055d414484b037be31e4da09e7
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Eutectic modification by ternary compound cluster formation in Al-Si alloys

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