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A visualization of shear strain in processing by high-pressure torsion

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Abstract

Optical microscopy was used to examine the shear strain imposed in duplex stainless steel disks during processing by high-pressure torsion (HPT). The results show a double-swirl pattern emerges in the early stages of HPT and the two centres of the swirl move towards the centre of the disk with increasing revolutions. Local shear vortices also develop with increasing numbers of revolutions. At 20 revolutions, there is a uniform shear strain pattern throughout the disk and no local shear vortices.

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Acknowledgements

The authors are indebted to Professor J. T. Wang for his extensive discussion of swirling phenomena in nature and they are grateful for scientific and technical input and support from the Australian Microscopy & Microanalysis Research Facility node at the University of Sydney. This project was supported by the Australian Research Council [Grant No. DP0772880 (Y.C., Y.B.W., and X.Z.L.)], the US Army Research Office (Grant No.W911NF-08-1-0201, T.G.L.) and the U.S. DOE IPP program (Y.T.Z.).

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Authors and Affiliations

  1. School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW, 2006, Australia

    Y. Cao, Y. B. Wang & X. Z. Liao

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

    S. N. Alhajeri & T. G. Langdon

  3. Shanghai Research Institute of Materials, 99 Handan Road, Shanghai, 200437, China

    W. L. Zheng

  4. Australian Key Centre for Microscopy & Microanalysis, The University of Sydney, Sydney, NSW, 2006, Australia

    S. P. Ringer

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

    T. G. Langdon

  6. Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695, USA

    Y. T. Zhu

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  1. Y. Cao
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  2. Y. B. Wang
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  4. X. Z. Liao
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Correspondence to X. Z. Liao.

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Cao, Y., Wang, Y.B., Alhajeri, S.N. et al. A visualization of shear strain in processing by high-pressure torsion. J Mater Sci 45, 765–770 (2010). https://doi.org/10.1007/s10853-009-3998-2

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  • DOI: https://doi.org/10.1007/s10853-009-3998-2

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