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Crystallization behaviour in a new multicomponent Ti 16.6 Zr 16.6 Hf 16.6 Ni 20 Cu 20 Al 10 metallic glass developed by the equiatomic substitution technique

Kim, K.B., Zhang, Y., Warren, P.J. and Cantor, B. (2003) Crystallization behaviour in a new multicomponent Ti 16.6 Zr 16.6 Hf 16.6 Ni 20 Cu 20 Al 10 metallic glass developed by the equiatomic substitution technique. Philosophical Magazine, 83 (20). pp. 2371-2381. ISSN 1478-6435

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Abstract

A new amorphous Ti16.6Zr16.6Hf16.6Ni20Cu20A110 alloy has been developed using the novel equiatomic substitution technique. Melt spinning Ti16.6Zr16.6Hf16.6Ni20Cu20A110 forms an amorphous phase with a large supercooled liquid region, ΔT=70°C. After isothermal annealing within the supercooled liquid region for 3 h at 470°C, the amorphous alloy crystallizes to form a fine-scale distribution of 2-5 nm nanocrystals, and the supercooled liquid region increases to ΔT=108°C. Atomic-scale compositional analysis of this partially crystalline material using a three-dimensional atom probe (3DAP) is unable to detect any compositional difference between the nanocrystals and the remaining amorphous phase. After annealing for 1 hr at 620°C, the amorphous alloy crystallizes to form 20-50nm equiaxed grains of a hexagonal-type C14 Laves phase with lattice parameters a = 5.2Aring and c = 9.0 Aring. 3DAP analysis shows that this Laves phase has a composition very close to that of the initial amorphous phase, suggesting that the alloy crystallizes via a polymorphic rather than a primary crystallization mechanism, despite the complexity of the alloy composition.

Item Type: Article
Academic Units: The University of York > Chemistry (York)
Depositing User: York RAE Import
Date Deposited: 26 Feb 2009 15:19
Last Modified: 26 Feb 2009 15:19
Published Version: http://dx.doi.org/10.1080/0141861031000113343
Status: Published
Publisher: Taylor & Francis
Identification Number: 10.1080/0141861031000113343
URI: http://eprints.whiterose.ac.uk/id/eprint/7183

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