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Achieving superplastic properties in a Pb–Sn eutectic alloy processed by equal-channel angular pressing

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Abstract

Experiments were conducted on a Pb-62% Sn eutectic alloy containing 160 ppm of Sb. The alloy was processed by equal-channel angular pressing (ECAP) through 1 to 5 passes at room temperature and then tested in tension at a temperature of 423 K using initial strain rates from 1.0 × 10−4 to 1.0 × 10−1 s−1. Excellent superplastic elongations were achieved at intermediate strain rates with a maximum elongation to failure of 2,665%. It is shown that, for processing through similar numbers of ECAP passes, these elongations are higher than in an earlier investigation using a Pb-62% Sn alloy of higher purity. The results are presented pictorially in the form of a deformation mechanism map by plotting normalized grain size against normalized stress at a temperature of 423 K.

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Acknowledgement

This study was supported in part by the National Science Foundation of the United States under Grant No. DMR-0855009 (MK and TGL).

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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

    Megumi Kawasaki & Terence G. Langdon

  2. Department of Materials Engineering, Federal University of São Carlos, São Carlos, SP, 13565-905, Brazil

    Anibal de A. Mendes, Vitor L. Sordi & Maurizio Ferrante

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

    Terence G. Langdon

Authors
  1. Megumi Kawasaki
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  2. Anibal de A. Mendes
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  3. Vitor L. Sordi
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  4. Maurizio Ferrante
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  5. Terence G. Langdon
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Correspondence to Megumi Kawasaki.

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Kawasaki, M., de A. Mendes, A., Sordi, V.L. et al. Achieving superplastic properties in a Pb–Sn eutectic alloy processed by equal-channel angular pressing. J Mater Sci 46, 155–160 (2011). https://doi.org/10.1007/s10853-010-4889-2

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  • DOI: https://doi.org/10.1007/s10853-010-4889-2

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