Solidification and microstructural formation of a ternary eutectic Al-Cu-Si cast alloy

A novel ternary eutectic Al-27%Cu-5%Si cast alloy was investigated to understand its solidification behavior and microstructural evolution. The studied alloy was cast, remelted and subjected to a rapid cooling in ice-water mixture, and also cooled slowly in air. The solidification sequence of the al...

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Autor principal:	Samuel A. Awe
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Casting Eutectic Solidification Thermo-Calc Ternary Al-Cu-Si alloy Microhardness Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/356c19208ae84a5185c22cdc463b0790
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spelling	oai:doaj.org-article:356c19208ae84a5185c22cdc463b07902021-11-22T04:18:16ZSolidification and microstructural formation of a ternary eutectic Al-Cu-Si cast alloy1018-363910.1016/j.jksues.2020.07.004https://doaj.org/article/356c19208ae84a5185c22cdc463b07902021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1018363920302683https://doaj.org/toc/1018-3639A novel ternary eutectic Al-27%Cu-5%Si cast alloy was investigated to understand its solidification behavior and microstructural evolution. The studied alloy was cast, remelted and subjected to a rapid cooling in ice-water mixture, and also cooled slowly in air. The solidification sequence of the alloy was studied using Thermo-CalC software with a subsequent DSC measurement. Micro- and nano-hardness tests were conducted at room temperature to assess the change of hardness associated with the microstructural changes due to the different cooling paths the alloy was subjected to. Thermodynamic analysis showed that the equilibrium solidification path of the eutectic alloy consists of three stages: precipitation of Al2Cu primary phase at 527.6 °C, evolution of binary eutectic (α-Al + Al2Cu) at 525.9 °C and the formation of ternary eutectic (α-Al + Al2Cu + Si) at 521.7 °C. DSC analysis of the alloy suggests only one endothermic peak at 536.4 ± 0.2 °C due to the melting of the alloy, which also corresponds to the ternary eutectic transition. The quenched alloy has a well-refined and uniform distribution of bimodal eutectic microstructure when compared with the slowly cooled alloy. The hardness of the quenched alloy was observed to be 16% higher than the slowly cooled alloy. The increased microhardness of the quenched alloy is attributed to the solid solution strengthening of the alloying elements and homogeneous dispersion of fine Si particles, and partly due to the higher volume fractions of both θ-Al2Cu and Si phases.Samuel A. AweElsevierarticleCastingEutecticSolidificationThermo-CalcTernary Al-Cu-Si alloyMicrohardnessEngineering (General). Civil engineering (General)TA1-2040ENJournal of King Saud University: Engineering Sciences, Vol 33, Iss 8, Pp 569-580 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Casting Eutectic Solidification Thermo-Calc Ternary Al-Cu-Si alloy Microhardness Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Casting Eutectic Solidification Thermo-Calc Ternary Al-Cu-Si alloy Microhardness Engineering (General). Civil engineering (General) TA1-2040 Samuel A. Awe Solidification and microstructural formation of a ternary eutectic Al-Cu-Si cast alloy
description	A novel ternary eutectic Al-27%Cu-5%Si cast alloy was investigated to understand its solidification behavior and microstructural evolution. The studied alloy was cast, remelted and subjected to a rapid cooling in ice-water mixture, and also cooled slowly in air. The solidification sequence of the alloy was studied using Thermo-CalC software with a subsequent DSC measurement. Micro- and nano-hardness tests were conducted at room temperature to assess the change of hardness associated with the microstructural changes due to the different cooling paths the alloy was subjected to. Thermodynamic analysis showed that the equilibrium solidification path of the eutectic alloy consists of three stages: precipitation of Al2Cu primary phase at 527.6 °C, evolution of binary eutectic (α-Al + Al2Cu) at 525.9 °C and the formation of ternary eutectic (α-Al + Al2Cu + Si) at 521.7 °C. DSC analysis of the alloy suggests only one endothermic peak at 536.4 ± 0.2 °C due to the melting of the alloy, which also corresponds to the ternary eutectic transition. The quenched alloy has a well-refined and uniform distribution of bimodal eutectic microstructure when compared with the slowly cooled alloy. The hardness of the quenched alloy was observed to be 16% higher than the slowly cooled alloy. The increased microhardness of the quenched alloy is attributed to the solid solution strengthening of the alloying elements and homogeneous dispersion of fine Si particles, and partly due to the higher volume fractions of both θ-Al2Cu and Si phases.
format	article
author	Samuel A. Awe
author_facet	Samuel A. Awe
author_sort	Samuel A. Awe
title	Solidification and microstructural formation of a ternary eutectic Al-Cu-Si cast alloy
title_short	Solidification and microstructural formation of a ternary eutectic Al-Cu-Si cast alloy
title_full	Solidification and microstructural formation of a ternary eutectic Al-Cu-Si cast alloy
title_fullStr	Solidification and microstructural formation of a ternary eutectic Al-Cu-Si cast alloy
title_full_unstemmed	Solidification and microstructural formation of a ternary eutectic Al-Cu-Si cast alloy
title_sort	solidification and microstructural formation of a ternary eutectic al-cu-si cast alloy
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/356c19208ae84a5185c22cdc463b0790
work_keys_str_mv	AT samuelaawe solidificationandmicrostructuralformationofaternaryeutecticalcusicastalloy
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Solidification and microstructural formation of a ternary eutectic Al-Cu-Si cast alloy

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