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    Time and temperature regime of continuous grain coarsening in an ECAP-processed Al(0.1 wt.% Sc) alloy

    Access Status
    Fulltext not available
    Authors
    Bommareddy, A.
    Quadir, Md Zakaria
    Ferry, M.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Bommareddy, A. and Quadir, M.Z. and Ferry, M. 2012. Time and temperature regime of continuous grain coarsening in an ECAP-processed Al(0.1 wt.% Sc) alloy. Journal of Alloys and Compounds. 527: pp. 145-151.
    Source Title
    Journal of Alloys and Compounds
    DOI
    10.1016/j.jallcom.2012.02.181
    ISSN
    0925-8388
    School
    John de Laeter Centre
    URI
    http://hdl.handle.net/20.500.11937/52681
    Collection
    • Curtin Research Publications
    Abstract

    An equiaxed, submicron grain size distribution was generated in an Al(0.1 wt.% Sc) alloy by processing through equal channel angular pressing followed by a low temperature pre-ageing heat treatment. The alloy was subsequently annealed for various times at 300, 350, 400 and 450 °C for investigating the thermal stability of the deformation microstructure. It was found that up to 400 °C, the submicron grain structure coarsens slowly and uniformly by a process of continuous recrystallization. Within this temperature range, the uniform dispersion of nano-sized Al 3Sc particles generated by the pre-ageing treatment substantially hinders grain coarsening by Zener pinning of the (sub)grain boundaries. At the higher annealing temperature of 450 °C, certain grains were found to grow discontinuously thereby generating a mixed microstructure consisting of both fine and coarse grains. The data in this study was combined with recent data for a higher solute Al(0.3 wt.% Sc) alloy for furthering our understanding of the time and temperature range in which this family of alloys is resistant to rapid, discontinuous grain coarsening (recrystallization). © 2011 Elsevier Ltd. All rights reserved.

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