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Development of high strength suction cast hypereutectic Al�20Si alloy containing gamma alumina and strontium

Acharya, M and Mondol, S and Mandal, A (2020) Development of high strength suction cast hypereutectic Al�20Si alloy containing gamma alumina and strontium. In: Materials Science and Technology (United Kingdom), 36 (5). pp. 623-630.

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Official URL: https://doi.org/10.1080/02670836.2020.1724403


In this research, the hypereutectic Al�20Si alloy, containing an optimised amount of 4 wt- γ-Al2O3 and 0.1 wt- strontium, was successfully synthesised through the suction casting process. The cooling rate (563 K s�1) involved during solidification was estimated by measuring secondary dendritic arm spacing. As a result, a significant change in the morphology of silicon was observed and also led to the formation of a small fraction of refined α-Al throughout the microstructure. The work demonstrates that high tensile properties in hypereutectic Al�20Si alloys can be achieved without the use of conventional inoculants (such as phosphorus). The suction cast Al�20Si alloy exhibits remarkably enhanced tensile properties of average ultimate tensile strength of 355 MPa and average ductility of 7.1. © 2020, © 2020 Institute of Materials, Minerals and Mining.

Item Type: Journal Article
Publication: Materials Science and Technology (United Kingdom)
Publisher: Taylor and Francis Ltd.
Additional Information: Copyright of this article belongs to Taylor and Francis Ltd.
Keywords: Alumina; Aluminum alloys; Aluminum oxide; Morphology; Silicon; Solidification; Strontium; Tensile strength, Eutectic si; Gamma alumina; High strength; modification; Primary Si; Secondary dendritic arm spacing; Suction casting; Ultimate tensile strength, High strength alloys
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 01 Apr 2021 06:23
Last Modified: 01 Apr 2021 06:23
URI: http://eprints.iisc.ac.in/id/eprint/64719

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