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Effect of strain reversals on the processing of high-purity aluminum by high-pressure torsion

  • Ultrafine Grained Materials
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Abstract

High-purity aluminum was processed by high-pressure torsion (HPT) under conventional monotonic (m-HPT) and cyclic (c-HPT) conditions where strain reversals are introduced in c-HPT during processing. Measurements show higher values of the Vickers microhardness in the center regions of all disks but these values are higher when processing by c-HPT by comparison with m-HPT for the same total number of turns. Slightly smaller grain sizes are observed in the c-HPT samples. It is shown that all of the microhardness values correlate with the estimated values of the equivalent strain and the results are consistent with earlier data reported under c-HPT conditions when it is recognized that the variation of hardness with equivalent strain is dependent upon the level of recovery within the material.

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Acknowledgement

This study was supported by the National Science Foundation of the United States under Grant No. DMR-0855009.

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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, Byungmin Ahn & Terence G. Langdon

  2. 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. Byungmin Ahn
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  3. Terence G. Langdon
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Correspondence to Megumi Kawasaki.

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Kawasaki, M., Ahn, B. & Langdon, T.G. Effect of strain reversals on the processing of high-purity aluminum by high-pressure torsion. J Mater Sci 45, 4583–4593 (2010). https://doi.org/10.1007/s10853-010-4420-9

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  • DOI: https://doi.org/10.1007/s10853-010-4420-9

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