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Title: | Microstructure and Mechanical Properties of Ultrafine Quaternary Al-Cu-Si-Mg Eutectic Alloy |
Authors: | Cai, Q Cantor, B Tong, VS Wang, F Mendis, CL Chang, ITH Fan, Z |
Keywords: | quaternary eutectic;aluminium;anomalous eutectic;orientation relationship |
Issue Date: | 21-Dec-2021 |
Publisher: | MDPI AG |
Citation: | Cai, Q., Cantor, B., Tong, V.S., Wang, F., Mendis, C.L., Chang, I.T.H. and Fan, Z. (2021) 'Microstructure and Mechanical Properties of Ultrafine Quaternary Al-Cu-Si-Mg Eutectic Alloy', Metals, 12 (1), 7, pp. 1 - 15. doi: 10.3390/met12010007. |
Abstract: | Copyright: © 2021 by the authors. 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 °C 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. |
URI: | https://bura.brunel.ac.uk/handle/2438/23845 |
DOI: | https://doi.org/10.3390/met12010007 |
Other Identifiers: | 7 |
Appears in Collections: | Brunel Centre for Advanced Solidification Technology (BCAST) |
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