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

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...

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Autores principales: Barrirero, J., Pauly, C., Engstler, M., Ghanbaja, J., Ghafoor, N., Li, J., Schumacher, P., Odén, M., Mücklich, F.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6445082/
https://www.ncbi.nlm.nih.gov/pubmed/30940873
http://dx.doi.org/10.1038/s41598-019-41919-2
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author Barrirero, J.
Pauly, C.
Engstler, M.
Ghanbaja, J.
Ghafoor, N.
Li, J.
Schumacher, P.
Odén, M.
Mücklich, F.
author_facet Barrirero, J.
Pauly, C.
Engstler, M.
Ghanbaja, J.
Ghafoor, N.
Li, J.
Schumacher, P.
Odén, M.
Mücklich, F.
author_sort Barrirero, J.
collection PubMed
description 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 Al(2)Si(2)Eu 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 Al(2)Si(2)Eu phase was found, where the following plane normals are parallel: 011(Si)//0001(Al2Si2Eu), 111(Si)//6[Formula: see text] 10(Al2Si2Eu) and 011(Si)//6[Formula: see text] 10(Al2Si2Eu). No crystallographic relationship was found between Si and Al(2)Si(2)Yb. The heterogeneous formation of coherent Al(2)Si(2)Eu clusters inside the Si-phase is suggested to trigger the modification of the microstructure.
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spelling pubmed-64450822019-04-05 Eutectic modification by ternary compound cluster formation in Al-Si alloys Barrirero, J. Pauly, C. Engstler, M. Ghanbaja, J. Ghafoor, N. Li, J. Schumacher, P. Odén, M. Mücklich, F. Sci Rep Article 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 Al(2)Si(2)Eu 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 Al(2)Si(2)Eu phase was found, where the following plane normals are parallel: 011(Si)//0001(Al2Si2Eu), 111(Si)//6[Formula: see text] 10(Al2Si2Eu) and 011(Si)//6[Formula: see text] 10(Al2Si2Eu). No crystallographic relationship was found between Si and Al(2)Si(2)Yb. The heterogeneous formation of coherent Al(2)Si(2)Eu clusters inside the Si-phase is suggested to trigger the modification of the microstructure. Nature Publishing Group UK 2019-04-02 /pmc/articles/PMC6445082/ /pubmed/30940873 http://dx.doi.org/10.1038/s41598-019-41919-2 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Barrirero, J.
Pauly, C.
Engstler, M.
Ghanbaja, J.
Ghafoor, N.
Li, J.
Schumacher, P.
Odén, M.
Mücklich, F.
Eutectic modification by ternary compound cluster formation in Al-Si alloys
title 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_short Eutectic modification by ternary compound cluster formation in Al-Si alloys
title_sort eutectic modification by ternary compound cluster formation in al-si alloys
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6445082/
https://www.ncbi.nlm.nih.gov/pubmed/30940873
http://dx.doi.org/10.1038/s41598-019-41919-2
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