Microstructure and Tensile Strength of an Al-Si-Fe-V Alloy: Vanadium and Solidification Thermal Parameters as Recycling Strategies

Cássio Silva, André Barros (), Adilson Vitor Rodrigues, Rafael Kakitani, Thiago Soares, Amauri Garcia and Noé Cheung
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Cássio Silva: Department of Manufacturing and Materials Engineering, University of Campinas–UNICAMP, Campinas 13083-860, SP, Brazil
André Barros: Department of Manufacturing and Materials Engineering, University of Campinas–UNICAMP, Campinas 13083-860, SP, Brazil
Adilson Vitor Rodrigues: Department of Manufacturing and Materials Engineering, University of Campinas–UNICAMP, Campinas 13083-860, SP, Brazil
Rafael Kakitani: Department of Manufacturing and Materials Engineering, University of Campinas–UNICAMP, Campinas 13083-860, SP, Brazil
Thiago Soares: Department of Manufacturing and Materials Engineering, University of Campinas–UNICAMP, Campinas 13083-860, SP, Brazil
Amauri Garcia: Department of Manufacturing and Materials Engineering, University of Campinas–UNICAMP, Campinas 13083-860, SP, Brazil
Noé Cheung: Department of Manufacturing and Materials Engineering, University of Campinas–UNICAMP, Campinas 13083-860, SP, Brazil

Sustainability, 2022, vol. 14, issue 21, 1-20

Abstract: One of the greatest challenges facing the recycling of Al-based alloys is handling Fe incorporation. The formation of Fe-rich phases has negative impacts on the mechanical behavior and may limit the usage of recycled alloys. In this context, V addition is regarded as a potential solution since it can inhibit the formation of such phases. However, the microstructure evolution of V-modified Al-based alloys is not fully understood, especially when different solidification cooling regimes are considered. Thus, this work investigates the microstructure and tensile properties of an Al-7Si-1Fe [wt.%] alloy modified with a 0.5 wt.%V addition. Directionally solidified samples were produced and subjected to microstructure analysis and tensile tests. It was found that the addition of V reduces the fraction of β-AlFeSi particles because of the formation of new V-rich phases. This was determinant to improve the tensile properties for faster cooling conditions during solidification. For moderate and slow cooling regimes, however, the V-containing alloy had a less favorable mechanical behavior due to the formation of larger β-AlFeSi particles. Finally, quantitative relationships are proposed for the prediction of tensile properties from microstructural parameters using multiple linear regression analysis.

Keywords: Al alloys; solidification; microstructure; recycling; tensile properties (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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