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Coupled eutectic growth in Al-Fe alloys

Part 2 Thermal stability of the Al-Al6Fe eutectic

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Abstract

The response to isothermal soaking at 773 to 913 K (0.83 to 0.99T m) for holding times upto 1000 h is reported for Al-3 wt% Fe/metastable Al-Al6Fe eutectic (10vol%Al6Fe) directionally grown at 1.24 mm sec−1. Breakdown is initiated by pinching-off and spherodization of Al6Fe eutectic rods within eutectic cells and by growth of equilibrium Al3Fe at grain boundaries and cell boundaries. Compared with equivalent Al-Al3Ni, results indicate enhanced thermal stability of Al-Al6Fe eutectic pending consumption by growing Al3Fe. Hardness decreased with increased soaking time according to an Orowan relationship with Al6Fe particle spacing.

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Author notes

  1. I. R. Hughes

    Present address: Alcan International Ltd, OX6 7SP, Banbury, Oxon, UK

Authors and Affiliations

  1. Department of Metallurgy, University of Sheffield, Sheffield, UK

    I. R. Hughes & H. Jones

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  1. I. R. Hughes
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  2. H. Jones
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Hughes, I.R., Jones, H. Coupled eutectic growth in Al-Fe alloys. J Mater Sci 12, 323–333 (1977). https://doi.org/10.1007/BF00566274

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