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Evolution of Strength and Homogeneity in a Magnesium AZ31 Alloy Processed by High-Pressure Torsion at Different Temperatures

Authors

  • Yi Huang,

    Corresponding author
    1. Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK
    • Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK.

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  • Roberto B. Figueiredo,

    1. Department of Materials Science and Civil Construction, Federal University of Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
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  • Thierry Baudin,

    1. ICMMO, UMR CNRS 8182 – Bât 410, Université Paris-Sud, 91405 Orsay Cedex, France
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  • François Brisset,

    1. ICMMO, UMR CNRS 8182 – Bât 410, Université Paris-Sud, 91405 Orsay Cedex, France
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  • Terence G. Langdon

    1. Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK
    2. Departments of Aerospace and Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089-1453, USA
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  • This work was supported by the European Research Council under ERC grant agreement no. 267464-SPDMETALS.

Abstract

Processing through the application of severe plastic deformation (SPD) is attractive because it produces significant grain refinement and high strength. The standard procedure for performing SPD processing is through the use of equal-channel angular pressing (ECAP) but in practice it is difficult to perform ECAP on the magnesium AZ31 alloy at room temperature because the material cracks or exhibits segmentation. This difficulty was avoided in the present investigation by processing the alloy using high-pressure torsion (HPT). The results show that HPT provides an excellent procedure for producing significant grain refinement in the AZ31 alloy. At temperatures of 296 and 373 K, the processed grain sizes are in the submicrometer range and there is an evolution toward microstructural homogeneity after 5 turns. By contrast, at the higher temperature of 473 K, which is a typical temperature for ECAP, the grains grow during the processing operation.

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