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Preparation of Cu-based bulk metallic glasses by suction casting

Figueroa, I.A., Carroll, P.A., Davies, H.A., Jones, H. and Todd, I. (2007) Preparation of Cu-based bulk metallic glasses by suction casting. In: SP07 Proceedings of the 5th Decennial International Conference on Solidification Processing. Department of Engineering Materials, University of Sheffield. , Sheffield , pp. 479-482. ISBN ISBN-13: 978-0-9522507-4-6

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Abstract

A series of Cu-Hf-Ti alloys prepared by rapid solidification of the melt and by copper mould casting were studied in the present work. Alloy ingots were prepared by arc-melting mixtures of pure metals in an argon atmosphere. An indication of the cooling rate obtained was determined using an Al-4.5 wt%Cu alloy. Cooling rates varied from 540 K/s for the centre section of a 4 mm die to 885 K/s for the outside wall section of the 2 mm die. The glass-forming ability, structure and thermal stability of Cu-Hf-Ti glassy alloys were studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and differential thermal analysis (DTA). Bulk glass formation was observed for the Cu64Hf36, Cu55Hf25Ti20 and Cu56Hf25Ti19 alloys, with critical diameters dc for a fully glassy structure of 1, 4 and 5 mm, respectively. The substitution of Hf by Ti increased the glassforming ability (GFA) and the thermal stability.

Item Type: Book Section
Copyright, Publisher and Additional Information: Copyright © 2007 Howard Jones on behalf of the named authors.
Keywords: rapid solidification, X-ray diffraction, thermal analysis, bulk metallic glasses
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield)
Depositing User: Repository Officer
Date Deposited: 21 Aug 2007 17:12
Last Modified: 08 Feb 2013 16:54
Status: Published
Publisher: Department of Engineering Materials, University of Sheffield.
Refereed: Yes
URI: http://eprints.whiterose.ac.uk/id/eprint/2641

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