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Microstructure and Mechanical Properties of Ultrafine Quaternary Al-Cu-Si-Mg Eutectic Alloy

Cai, Q; Cantor, B; Tong, V V S; Wang, F; Mendis, C L; Chang, I T H; Fan, Z Y (2022) Microstructure and Mechanical Properties of Ultrafine Quaternary Al-Cu-Si-Mg Eutectic Alloy. Metals, 12 (1). 7

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Abstract

The microstructure evolution and mechanical properties of quaternary Al-Cu-Si-Mg eutectic alloy prepared via arc melting and suction casting were studied. This alloy exhibits a single endothermic DSC peak with a melting temperature of 509 ºC upon heating, suggesting a eutectic reaction. The cast alloy microstructure consisted of four phases, α-Al, Al2Cu (θ), Si and Al4Cu2Mg8Si7 (Q), in the eutectic cells and also in the nano-scale anomalous eutectic in the intercellular regions. The eutectic cells show different morphologies in different parts of the sample. Well-defined orientation relationships between the α-Al, Al2Cu, and Q phases were found in the eutectic cell centres, while decoupled growth of Q phase occurred at the cell boundaries. The bimodal microstructure exhibits excellent compressive mechanical properties, including a yield strength of 835 ± 35 MPa, a fracture strength of ~1 GPa and a compressive fracture strain of 4.7 ± 1.1%. The high strength is attributed to a combination of a refined eutectic structure and strengthening from multiple hard phases

Item Type: Article
Keywords: quaternary eutectic; aluminium; anomalous eutectic; orientation relationship
Subjects: Advanced Materials > Microstructural Characterisation
Divisions: Materials and Mechanical Metrology
Identification number/DOI: 10.3390/met12010007
Last Modified: 20 Oct 2022 13:10
URI: http://eprintspublications.npl.co.uk/id/eprint/9530

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