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An overview of the effects of bifilms on the structure and properties of cast alloys

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Abstract

A short overview of the role of bifilms (double oxide films) in cast Al alloys includes control of (1) grain size, because of the suppression of convection; (2) dendrite-arm spacing (DAS) as a result of isolated regions of liquid devoid of nuclei that consequently undercool; and (3) the mechanism of the modification of Al-Si alloys by Na and Sr, which is explained for the first time by the deactivation of bifilms as substrates for Si nucleation and growth.

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Authors and Affiliations

  1. the Department of Metallurgy and Materials, The University of Birmingham, United Kingdom

    John Campbell (Emeritus Professor)

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  1. John Campbell
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Correspondence to John Campbell.

Additional information

This article is based on a presentation made in the John Campbell Symposium on Shape Casting, held during the TMS Annual Meeting, February 13–17, 2005, in San Francisco, CA.

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Campbell, J. An overview of the effects of bifilms on the structure and properties of cast alloys. Metall Mater Trans B 37, 857–863 (2006). https://doi.org/10.1007/BF02735006

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