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Open AccessArticle

Influence of Copper Addition in AlSi7MgCu Alloy on Microstructure Development and Tensile Strength Improvement

1
CIMOS-P.P.C. Buzet, d.o.o., Most 24, 52420 Buzet, Croatia
2
Department for Process Metallurgy, Faculty of Metallurgy, University of Zagreb, Aleja Narodnih Heroja 3, 44103 Sisak, Croatia
3
Materials & Structural Analysis Division, Thermo Fisher Scientific, Europe NanoPort, Achtseweg Noord 5, 5651 GG Eindhoven, The Netherlands
*
Author to whom correspondence should be addressed.
Metals 2020, 10(12), 1623; https://doi.org/10.3390/met10121623
Received: 27 October 2020 / Revised: 24 November 2020 / Accepted: 26 November 2020 / Published: 2 December 2020
(This article belongs to the Special Issue Advanced Hard Materials)
Commercial AlSi7Mg alloy represents the usual choice for complex geometry casting production. The market imperative to improve mechanical properties imposed the design of new chemical composition of AlSi7MgCu alloy with high content of Cu (up to 1.435 wt.%). This represents a challenge in order to achieve advanced properties. The interaction of a number of alloying (Si, Mg, Cu) and trace elements (Fe, Mn) influenced a wide range of complex reactions occurring and therefore leading to intermetallic phase precipitation. The characterization of novel chemical composition interaction and its solidification sequence was achieved by modelling an equilibrium phase diagram, simultaneously performing both thermal analysis and metallographic investigations. Copper influence was indicated in the whole solidification process starting with infiltration in modified Chinese script phase Al15(Fe,Mn,Cu)3Si2, beside common intermetallic Al5FeSi. Copper addition encourages formation of compact complex intermetallic phases Al5Cu2Mg8Si6 and Al8(Fe,Mn,Cu)Mg3Si6. Solidification ended with secondary eutectic αAl + Al2Cu + βSi. Microstructure investigation allows volume reconstruction of the microstructure and distribution of particular phases. Chemical compositions enriched in copper content and developed microstructural constituent through solidification sequence of AlSi7MgCu alloy contribute to a significant increase in mechanical properties already in an as-cast state. View Full-Text
Keywords: AlSi7MgCu alloy; copper; microstructure; solidification sequence; mechanical properties AlSi7MgCu alloy; copper; microstructure; solidification sequence; mechanical properties
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MDPI and ACS Style

Stanić, D.; Zovko Brodarac, Z.; Li, L. Influence of Copper Addition in AlSi7MgCu Alloy on Microstructure Development and Tensile Strength Improvement. Metals 2020, 10, 1623. https://doi.org/10.3390/met10121623

AMA Style

Stanić D, Zovko Brodarac Z, Li L. Influence of Copper Addition in AlSi7MgCu Alloy on Microstructure Development and Tensile Strength Improvement. Metals. 2020; 10(12):1623. https://doi.org/10.3390/met10121623

Chicago/Turabian Style

Stanić, Davor; Zovko Brodarac, Zdenka; Li, Letian. 2020. "Influence of Copper Addition in AlSi7MgCu Alloy on Microstructure Development and Tensile Strength Improvement" Metals 10, no. 12: 1623. https://doi.org/10.3390/met10121623

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