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A study on the formation of crystalline phases during solidification and crystallisation in the bulk metallic glass of Zr53Cu21Al10Ni8Ti8 composition

Neogy, S and Tewari, R and Dey, GK and Banerjee, S and Ranganathan, S (2012) A study on the formation of crystalline phases during solidification and crystallisation in the bulk metallic glass of Zr53Cu21Al10Ni8Ti8 composition. In: PHILOSOPHICAL MAGAZINE, 92 (17). pp. 2136-2149.

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Official URL: http://dx.doi.org/10.1080/14786435.2012.669061

Abstract

The present paper considers the formation of crystalline phases during solidification and crystallisation of the Zr53Cu21Al10Ni8Ti8 alloy. Solidification was carried out by a copper mould casting technique, which yielded a partially crystalline microstructure comprising a `big cube phase' in a dendritic morphology and a bct Zr2Ni phase. Detailed high-resolution microscopy was carried out to determine possible mechanisms for the formation of the crystalline phases. Based on microstructural examinations, it was established that the dendrites grew by the attachment of atomistic ledges. The bct Zr2Ni phase, formed during solidification and crystallisation, showed various types of faults depending on the crystallite size, and its crystallography was examined in detail. It has been shown that the presence of these faults could be explained by anti-site occupancy in the bct lattice of the Zr2Ni phase.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Taylor and Francis
Keywords: bulk metallic glass;big cube phase;dendrites;Zr2Ni; transmission electron microscopy (TEM)
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 23 Jun 2012 10:39
Last Modified: 23 Jun 2012 10:39
URI: http://eprints.iisc.ernet.in/id/eprint/44718

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