Influence of the Small Sc and Zr Additions on the As-Cast Microstructure of Al–Mg–Si Alloys with Excess Silicon

This research is devoted to the study effects of complex alloying of Al-0.3 wt. % Mg-1 wt. % Si and Al-0.5 wt. % Mg-1.3 wt. % Si alloys by small additions of Sc and Zr on the microstructure in the as-cast condition. The effect of small additions of these elements on the microhardness, electrical con...

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Autores principales:	Evgenii Aryshenskii, Maksim Lapshov, Jurgen Hirsch, Sergey Konovalov, Viacheslav Bazhenov, Alexander Drits, Denis Zaitsev
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	aluminum alloys phase composition casting Sc and Zr small addition grain refinement dispersoid Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/3693acedbaaa4016be5618537c98904a
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spelling	oai:doaj.org-article:3693acedbaaa4016be5618537c98904a2021-11-25T18:22:02ZInfluence of the Small Sc and Zr Additions on the As-Cast Microstructure of Al–Mg–Si Alloys with Excess Silicon10.3390/met111117972075-4701https://doaj.org/article/3693acedbaaa4016be5618537c98904a2021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1797https://doaj.org/toc/2075-4701This research is devoted to the study effects of complex alloying of Al-0.3 wt. % Mg-1 wt. % Si and Al-0.5 wt. % Mg-1.3 wt. % Si alloys by small additions of Sc and Zr on the microstructure in the as-cast condition. The effect of small additions of these elements on the microhardness, electrical conductivity, grain size and phase composition of the indicated alloy systems was studied. The methods of optical and electron microscopy were used for the study. Moreover, the phase composition was calculated using the Thermo-Calc software package. The study showed a strong effect of the chemical composition of investigated alloys on the size of the grains, which, with a certain combination of additives, can decrease several times. Grain refinement occurs both due to supercooling and formation of primary Al<sub>3</sub>Sc particles in the liquid phase. Alloys based on Al-0.5 wt. % Mg-1.3 wt. % Si are more prone to the formation of this phase since a lower concentration of Sc is required for it to occur. In addition, more silicon interacts with other elements. At the same time, Al-0.3 wt. % Mg-1 wt. % Si requires lower temperature for complete dissolution of Mg<sub>2</sub>Si, which can contribute to more efficient heat treatment, which includes reducing the number of steps. TEM data show that during ingot cooling (AlSi)<sub>3</sub>ScZr dispersoid precipitates. This dispersoid could precipitate as coherent and semi-coherent particles with L1<sub>2</sub> structure as well as needle-shaped particles. The precipitation of coherent and semi-coherent particles during cooling of the ingot indicates that they can be obtained during subsequent multistage heat treatment. In addition, in the Al<i>0.5</i>Mg<i>1.3</i>Si<i>0.3</i>Sc alloy, metastable β″ (Mg<sub>5</sub>Si<sub>6</sub>) are precipitated.Evgenii AryshenskiiMaksim LapshovJurgen HirschSergey KonovalovViacheslav BazhenovAlexander DritsDenis ZaitsevMDPI AGarticlealuminum alloysphase compositioncastingSc and Zr small additiongrain refinementdispersoidMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1797, p 1797 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	aluminum alloys phase composition casting Sc and Zr small addition grain refinement dispersoid Mining engineering. Metallurgy TN1-997
spellingShingle	aluminum alloys phase composition casting Sc and Zr small addition grain refinement dispersoid Mining engineering. Metallurgy TN1-997 Evgenii Aryshenskii Maksim Lapshov Jurgen Hirsch Sergey Konovalov Viacheslav Bazhenov Alexander Drits Denis Zaitsev Influence of the Small Sc and Zr Additions on the As-Cast Microstructure of Al–Mg–Si Alloys with Excess Silicon
description	This research is devoted to the study effects of complex alloying of Al-0.3 wt. % Mg-1 wt. % Si and Al-0.5 wt. % Mg-1.3 wt. % Si alloys by small additions of Sc and Zr on the microstructure in the as-cast condition. The effect of small additions of these elements on the microhardness, electrical conductivity, grain size and phase composition of the indicated alloy systems was studied. The methods of optical and electron microscopy were used for the study. Moreover, the phase composition was calculated using the Thermo-Calc software package. The study showed a strong effect of the chemical composition of investigated alloys on the size of the grains, which, with a certain combination of additives, can decrease several times. Grain refinement occurs both due to supercooling and formation of primary Al<sub>3</sub>Sc particles in the liquid phase. Alloys based on Al-0.5 wt. % Mg-1.3 wt. % Si are more prone to the formation of this phase since a lower concentration of Sc is required for it to occur. In addition, more silicon interacts with other elements. At the same time, Al-0.3 wt. % Mg-1 wt. % Si requires lower temperature for complete dissolution of Mg<sub>2</sub>Si, which can contribute to more efficient heat treatment, which includes reducing the number of steps. TEM data show that during ingot cooling (AlSi)<sub>3</sub>ScZr dispersoid precipitates. This dispersoid could precipitate as coherent and semi-coherent particles with L1<sub>2</sub> structure as well as needle-shaped particles. The precipitation of coherent and semi-coherent particles during cooling of the ingot indicates that they can be obtained during subsequent multistage heat treatment. In addition, in the Al<i>0.5</i>Mg<i>1.3</i>Si<i>0.3</i>Sc alloy, metastable β″ (Mg<sub>5</sub>Si<sub>6</sub>) are precipitated.
format	article
author	Evgenii Aryshenskii Maksim Lapshov Jurgen Hirsch Sergey Konovalov Viacheslav Bazhenov Alexander Drits Denis Zaitsev
author_facet	Evgenii Aryshenskii Maksim Lapshov Jurgen Hirsch Sergey Konovalov Viacheslav Bazhenov Alexander Drits Denis Zaitsev
author_sort	Evgenii Aryshenskii
title	Influence of the Small Sc and Zr Additions on the As-Cast Microstructure of Al–Mg–Si Alloys with Excess Silicon
title_short	Influence of the Small Sc and Zr Additions on the As-Cast Microstructure of Al–Mg–Si Alloys with Excess Silicon
title_full	Influence of the Small Sc and Zr Additions on the As-Cast Microstructure of Al–Mg–Si Alloys with Excess Silicon
title_fullStr	Influence of the Small Sc and Zr Additions on the As-Cast Microstructure of Al–Mg–Si Alloys with Excess Silicon
title_full_unstemmed	Influence of the Small Sc and Zr Additions on the As-Cast Microstructure of Al–Mg–Si Alloys with Excess Silicon
title_sort	influence of the small sc and zr additions on the as-cast microstructure of al–mg–si alloys with excess silicon
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/3693acedbaaa4016be5618537c98904a
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Influence of the Small Sc and Zr Additions on the As-Cast Microstructure of Al–Mg–Si Alloys with Excess Silicon

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