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Review: achieving superplasticity in metals processed by high-pressure torsion

  • Ultrafinegrained Materials
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Abstract

It is now well established that processing by equal-channel angular pressing (ECAP) leads to grain refinement and produces materials having the potential for exhibiting extensive superplastic flow at elevated temperatures. High-pressure torsion (HPT) is also an effective procedure for refining the grain sizes of polycrystalline metals to the submicrometer or even the nanometer level, and recent results show that this processing method also gives materials that exhibit excellent superplastic characteristics. This report examines the various publications describing superplasticity in metallic alloys processed by HPT. A comprehensive tabulation is presented listing all of the results to date showing true superplastic elongations of at least 400 % after processing by HPT. Examples of superplastic elongations are described for tensile tests conducted using specimens cut from either disk or ring samples. An analysis shows that the flow behavior of various Al and Mg alloys is in good agreement with the predicted flow behavior for conventional superplastic materials.

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Acknowledgements

This work was supported in part by the National Science Foundation of the United States under Grant No. DMR-1160966 and in part by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS.

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Authors and Affiliations

  1. Division of Materials Science and Engineering, Hanyang University, Seoul, 133-791, South Korea

    Megumi Kawasaki

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

    Megumi Kawasaki & Terence G. Langdon

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

    Terence G. Langdon

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  1. Megumi Kawasaki
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Correspondence to Megumi Kawasaki.

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Kawasaki, M., Langdon, T.G. Review: achieving superplasticity in metals processed by high-pressure torsion. J Mater Sci 49, 6487–6496 (2014). https://doi.org/10.1007/s10853-014-8204-5

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