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Microstructural evolution in semi-solid AA7034

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Abstract

The kinetics of semi-solid grain coarsening in a spray-formed AA7034 aluminium alloy were determined by the use of ex situ coarsening experiments. The coarsening rate constant of the alloy decreases with increasing solid fraction for solid fractions greater than 0.65. For solid fractions between 0.6 and 0.65, the coarsening rate constant increases as the solid fraction increases. For solid fractions below 0.6, the coarsening rate constant decreases again with increasing solid fraction. A model of flow-enhanced diffusion was developed to explain the grain-coarsening behaviour at low solid fractions, with flow caused by the macroscopic shape change of the uncontained semi-solid material during coarsening. Together with previous liquid film and modified liquid film migration models, the flow-enhanced diffusion model shows qualitative agreement with available experimental results.

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Author notes

  1. Hee-Soo Kim

    Present address: CAE_G, Central R&D Institute, Samsung Electro-Mechanics, 314 Maetan 3-Dong, Yeongtong-Gu, Suwon, Gyunggi-Do, 443-743, Korea

Authors and Affiliations

  1. Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK

    Hee-Soo Kim & Ian C. Stone

  2. University of York, Heslington, York, YO10 5DD, UK

    Brian Cantor

Authors
  1. Hee-Soo Kim
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  2. Ian C. Stone
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  3. Brian Cantor
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Correspondence to Ian C. Stone.

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Kim, HS., Stone, I.C. & Cantor, B. Microstructural evolution in semi-solid AA7034. J Mater Sci 43, 1292–1304 (2008). https://doi.org/10.1007/s10853-007-2151-3

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  • DOI: https://doi.org/10.1007/s10853-007-2151-3

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