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The influence of Sc on thermal stability of a nanocrystalline Al-Mg alloy processed by cryogenic ball milling

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Abstract

The microstructural evolution during annealing of a cryogenically ball-milled Al-7.5Mg-0.3Sc (in wt pct) was examined using differential scanning calorimetry and transmission electron microscopy (TEM). The as-milled alloy was a supersaturated fcc solid solution with an average grain size of ∼25 nm and heterogeneous grain morphologies and size distributions. Calorimetric measurements at a constant heating rate of 32 K/min indicated two exothermic events in association with recovery from 100 °C to 240 °C and recrystallization from 300 °C to 450 °C. Prior to recrystallization, the precipitation of Al3Sc may occur at low annealing temperatures producing a nonuniform dispersion of approximately spherical particles with diameters of 4 to 5 nm. Recrystallization gave rise to heterogeneous microstructures with bimodal grain size distributions, which may result from the heterogeneity of microstructure in the as-milled state. The heterogeneous microstructures of the recrystallized Al-Mg-Sc alloy were similar to those observed in the recrystallized Sc-free Al-Mg alloy.

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Author notes

  1. F. Zhou (Research Associate, R&D Senior Engineer)

    Present address: the Department of Materials Science, University of Southern California, 90089-0241, Los Angeles, CA

Authors and Affiliations

  1. Edwards Lifesciences Corporation, 92614, Irvine, CA

    F. Zhou (Research Associate, R&D Senior Engineer)

  2. the Department of Materials Science, University of Southern California, 90089-0241, Los Angeles, CA

    Z. Lee (Postdoctoral Research Associate) & S. R. Nutt (Professor)

  3. the Department of Chemical Engineering and Materials Science, University of California at Davis, 95616-5294, Davis, CA

    E. J. Lavernia (Professor)

Authors
  1. F. Zhou
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  2. Z. Lee
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  3. S. R. Nutt
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  4. E. J. Lavernia
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Zhou, F., Lee, Z., Nutt, S.R. et al. The influence of Sc on thermal stability of a nanocrystalline Al-Mg alloy processed by cryogenic ball milling. Metall Mater Trans A 36, 1587–1594 (2005). https://doi.org/10.1007/s11661-005-0250-9

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  • DOI: https://doi.org/10.1007/s11661-005-0250-9

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