Influence of Cu on modifying the beta phase and enhancing the mechanical properties of recycled Al-Si-Fe cast alloys

Abstract High iron impurity affects the castability and the tensile properties of the recycled Al-Si alloys due to the presence of the Fe containing intermetallic β-Al9Fe2Si2 phase. To date only Mn addition is known to transform the β-Al9Fe2Si2 phase in the Al-Si-Fe system. However, for the first ti...

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Autores principales:	C. B. Basak, N. Hari Babu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/666c0dd3a02f413b961cc0d9da3246e3
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spelling	oai:doaj.org-article:666c0dd3a02f413b961cc0d9da3246e32021-12-02T12:32:25ZInfluence of Cu on modifying the beta phase and enhancing the mechanical properties of recycled Al-Si-Fe cast alloys10.1038/s41598-017-05937-22045-2322https://doaj.org/article/666c0dd3a02f413b961cc0d9da3246e32017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05937-2https://doaj.org/toc/2045-2322Abstract High iron impurity affects the castability and the tensile properties of the recycled Al-Si alloys due to the presence of the Fe containing intermetallic β-Al9Fe2Si2 phase. To date only Mn addition is known to transform the β-Al9Fe2Si2 phase in the Al-Si-Fe system. However, for the first time, as reported here, it is shown that β-phase transforms to the ω-Al7Cu2Fe phase in the presence of Cu, after solutionization at 793 K. The ω-phase decomposes below 673 K resulting into the formation of θ-Al2Cu phase. However, the present thermodynamic description of the Al-Si-Fe-Cu system needs finer tuning to accurately predict the stability of the ω-phase in these alloys. In the present study, an attempt was made to enhance the strength of Al-6wt%Si-2wt%Fe model recycled cast alloy with different amount of Cu addition. Microstructural and XRD analysis were carried out in detail to show the influence of Cu and the stability range of the ω-phase. Tensile properties and micro-hardness values are also reported for both as-cast and solutionized alloys with different amount of Cu without and with ageing treatment at 473 K. The increase in strength due to addition of Cu, in Fe-rich Al-Si alloys is promising from the alloy recyclability point of view.C. B. BasakN. Hari BabuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q C. B. Basak N. Hari Babu Influence of Cu on modifying the beta phase and enhancing the mechanical properties of recycled Al-Si-Fe cast alloys
description	Abstract High iron impurity affects the castability and the tensile properties of the recycled Al-Si alloys due to the presence of the Fe containing intermetallic β-Al9Fe2Si2 phase. To date only Mn addition is known to transform the β-Al9Fe2Si2 phase in the Al-Si-Fe system. However, for the first time, as reported here, it is shown that β-phase transforms to the ω-Al7Cu2Fe phase in the presence of Cu, after solutionization at 793 K. The ω-phase decomposes below 673 K resulting into the formation of θ-Al2Cu phase. However, the present thermodynamic description of the Al-Si-Fe-Cu system needs finer tuning to accurately predict the stability of the ω-phase in these alloys. In the present study, an attempt was made to enhance the strength of Al-6wt%Si-2wt%Fe model recycled cast alloy with different amount of Cu addition. Microstructural and XRD analysis were carried out in detail to show the influence of Cu and the stability range of the ω-phase. Tensile properties and micro-hardness values are also reported for both as-cast and solutionized alloys with different amount of Cu without and with ageing treatment at 473 K. The increase in strength due to addition of Cu, in Fe-rich Al-Si alloys is promising from the alloy recyclability point of view.
format	article
author	C. B. Basak N. Hari Babu
author_facet	C. B. Basak N. Hari Babu
author_sort	C. B. Basak
title	Influence of Cu on modifying the beta phase and enhancing the mechanical properties of recycled Al-Si-Fe cast alloys
title_short	Influence of Cu on modifying the beta phase and enhancing the mechanical properties of recycled Al-Si-Fe cast alloys
title_full	Influence of Cu on modifying the beta phase and enhancing the mechanical properties of recycled Al-Si-Fe cast alloys
title_fullStr	Influence of Cu on modifying the beta phase and enhancing the mechanical properties of recycled Al-Si-Fe cast alloys
title_full_unstemmed	Influence of Cu on modifying the beta phase and enhancing the mechanical properties of recycled Al-Si-Fe cast alloys
title_sort	influence of cu on modifying the beta phase and enhancing the mechanical properties of recycled al-si-fe cast alloys
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/666c0dd3a02f413b961cc0d9da3246e3
work_keys_str_mv	AT cbbasak influenceofcuonmodifyingthebetaphaseandenhancingthemechanicalpropertiesofrecycledalsifecastalloys AT nharibabu influenceofcuonmodifyingthebetaphaseandenhancingthemechanicalpropertiesofrecycledalsifecastalloys
_version_	1718394098269814784

Influence of Cu on modifying the beta phase and enhancing the mechanical properties of recycled Al-Si-Fe cast alloys

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