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Crystallization processes in an Ni-Si-B glassy alloy

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Abstract

The crystallization of metallic glasses is often conveniently separated into distinct nucleation and growth processes. The nucleation or formation of crystals is a poorly understood stage which may depend on many properties of the alloy in question as well as on the preparation conditions. Nucleation may involve internal homogeneous or heterogeneous mechanisms or localized, surface processes. An easy glass-forming alloy has been examined after preparation under clean, and very-fast-cooling conditions. These careful preparation conditions have significantly slowed crystallization kinetics by slowing the bulk nucleation kinetics. Accordingly the material shows an extreme sensitivity to surface contamination and intensive associated crystal nucleation: in addition the inner parts of the material crystallize by an apparently homogeneous nucleation process. The results obtained are important in emphasizing the role of quenched-in structures and contaminants on enhancing crystal nucleation activity. An improved understanding of these factors could play a significant role in the development of more-stable, or larger-bulk metallic glasses.

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Authors and Affiliations

  1. Institute of Structural Metallurgy, University of Neuchâtel, 2000, Neuchâtel, Switzerland

    M. -H. Zuercher & D. G. Morris

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  1. M. -H. Zuercher
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  2. D. G. Morris
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Zuercher, M.H., Morris, D.G. Crystallization processes in an Ni-Si-B glassy alloy. J Mater Sci 23, 515–522 (1988). https://doi.org/10.1007/BF01174678

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  • DOI: https://doi.org/10.1007/BF01174678

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