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Study of Microstructure Evolution during Semi-Solid Processing of an In-Situ Al Alloy Composite

Kumar, Santosh and Das, Prosenjit and Tiwari, Sandeep K and Mondal, Manas K and Bera, Supriya and Roy, Himadri and Samanta, Sudip K (2015) Study of Microstructure Evolution during Semi-Solid Processing of an In-Situ Al Alloy Composite. In: MATERIALS AND MANUFACTURING PROCESSES, 30 (3). pp. 356-366.

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Official URL: http://dx.doi.org/ 10.1080/10426914.2014.952040


In the present work, effect of pouring temperature (650 degrees C, 655 degrees C, and 660 degrees C) on semi-solid microstructure evolution of in-situ magnesium silicide (Mg2Si) reinforced aluminum (Al) alloy composite has been studied. The shear force exerted by the cooling slope during gravity driven flow of the melt facilitates the formation of near spherical primary Mg2Si and primary Al grains. Shear driven melt flow along the cooling slope and grain fragmentation have been identified as the responsible mechanisms for refinement of primary Mg2Si and Al grains with improved sphericity. Results show that, while flowing down the cooling slope, morphology of primary Mg2Si and primary Al transformed gradually from coarse dendritic to mixture of near spherical particles, rosettes, and degenerated dendrites. In terms of minimum grain size and maximum sphericity, 650 degrees C has been identified as the ideal pouring temperature for the cooling slope semi-solid processing of present Al alloy composite. Formation of spheroidal grains with homogeneous distribution of reinforcing phase (Mg2Si) improves the isotropic property of the said composite, which is desirable in most of the engineering applications.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the TAYLOR & FRANCIS INC, 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA
Keywords: Primary Al; Rosette; Metal matrix composite; Spheroidal; Semisolid; Cooling slope; Primary Mg2Si
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 19 Mar 2015 11:35
Last Modified: 19 Mar 2015 11:35
URI: http://eprints.iisc.ac.in/id/eprint/51024

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