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The tensile response of a fine-grained AA5754 alloy produced by asymmetric rolling and annealing

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Abstract

Asymmetric rolling (ASR) followed by annealing has been used to produce very fine grain sizes in the commercial Al-3 wt pct Mg alloy, AA5754. The appropriate rolling and annealing practice can produce grain sizes as small as 1 μm, and the tensile response of this fine-grained material has been compared with that of other fine-grained alloys produced by alternative methods. It is shown that the material obeys a Hall-Petch relationship, with a slope very similar to that of AA5754 produced by equal-channel angular extrusion (ECAE) and by conventional hot and cold rolling. The high yield strengths at fine grain sizes are accompanied by a low tensile elongation, which reflects the stress-strain response of very fine grain sizes. The stress-strain response can be described by the Voce equation, with the dislocation-accumulation rate decreasing with decreasing grain size and the rate of dynamic recovery being controlled by the Mg solute. Tensile elongations generally decrease with decreasing grain size, but a duplex grain structure appears to provide a good compromise between strength and elongation.

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Authors and Affiliations

  1. the Kingston R&D Centre, Alcan International, K7L 5L9, Kingston, ON, Canada

    H. Jin (Research Scientist) & D. J. Lloyd (Principal Scientist)

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  1. H. Jin
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  2. D. J. Lloyd
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Jin, H., Lloyd, D.J. The tensile response of a fine-grained AA5754 alloy produced by asymmetric rolling and annealing. Metall Mater Trans A 35, 997–1006 (2004). https://doi.org/10.1007/s11661-004-1003-x

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  • DOI: https://doi.org/10.1007/s11661-004-1003-x

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