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Developing superplasticity in a magnesium AZ31 alloy by ECAP

  • Ultrafine-Grained Materials
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Abstract

The processing of a magnesium AZ31 alloy by equal-channel angular pressing refines the grain size to ~2.2 μm, but annealing for 30 min at 673 K coarsens the grains to ~6.0 μm. Despite this microstructural instability, the alloy is superplastic when pulled in tension at temperatures in the range of 623–723 K with elongations up to >1000% at strain rates at and below 10−4 s−1. Experiments within the superplastic regime show the strain rate sensitivity is ~0.5 and the activation energy is close to the value for grain boundary diffusion. It is demonstrated by calculation that the experimental results are in good agreement with a model for superplasticity based on grain boundary sliding.

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Acknowledgements

One of the authors (RBF) was supported by a CAPES/Fulbright Scholarship. This work was supported by the U.S. Army Research Office under Grant No. W911NF-05-1-0046.

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Authors and Affiliations

  1. Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA, 90089-1453, USA

    Roberto B. Figueiredo & Terence G. Langdon

  2. Materials Research Group, School of Engineering Sciences, University of Southampton, Southampton, SO17 1BJ, UK

    Terence G. Langdon

Authors
  1. Roberto B. Figueiredo
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  2. Terence G. Langdon
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Correspondence to Roberto B. Figueiredo.

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Figueiredo, R.B., Langdon, T.G. Developing superplasticity in a magnesium AZ31 alloy by ECAP. J Mater Sci 43, 7366–7371 (2008). https://doi.org/10.1007/s10853-008-2846-0

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  • DOI: https://doi.org/10.1007/s10853-008-2846-0

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