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In-situ observations of the annealing of liquid lead inclusions entrained in an aluminium matrix

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Abstract

The changes in configuration of cylindrical inclusions of molten lead entrained in an aluminium matrix have been observedin-situ using hot-stage high voltage electron microscopy. Three distinct types of events were observed and analysed. The cylindrical inclusions spheroidized over a wide temperature range due to capillary forces; the resultant spherical inclusions migrated in the temperature gradient caused by electron beam heating; and impinging inclusions coalesced due to capillary forces.

The kinetics of the spheroidization and sintering events are controlled by the rate of diffusion of Al in liquid Pb and the data yield estimates for this diffusivity at various temperatures. The mechanism operating during thermal migration depends on the radius of the inclusion; volume diffusion kinetics control for the larger inclusions (r>0.8 μm) and interface kinetics dominate the smaller inclusions (r<0.8 μm).

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Authors and Affiliations

  1. Division of Inorganic and Metallic Structure, National Physical Laboratory, Teddington, Middlesex, UK

    M. McLean & M. S. Loveday

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  1. M. McLean
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  2. M. S. Loveday
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McLean, M., Loveday, M.S. In-situ observations of the annealing of liquid lead inclusions entrained in an aluminium matrix. J Mater Sci 9, 1104–1114 (1974). https://doi.org/10.1007/BF00552825

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  • DOI: https://doi.org/10.1007/BF00552825

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