Journal of Materials Science

, Volume 45, Issue 17, pp 4545–4553 | Cite as

Unusual macroscopic shearing patterns observed in metals processed by high-pressure torsion

  • Y. Cao
  • M. Kawasaki
  • Y. B. Wang
  • S. N. Alhajeri
  • X. Z. Liao
  • W. L. Zheng
  • S. P. Ringer
  • Y. T. Zhu
  • T. G. Langdon
Ultrafine Grained Materials


A duplex stainless steel was processed by high-pressure torsion (HPT) and then examined by optical microscopy. The results reveal unusual flow patterns including double-swirl strains, shear vortices, and the presence of significant local turbulence. Similar flow behavior was also visible in disks of high-purity aluminum and a Zn–22%Al eutectoid alloy. These complex flow patterns and the presence of double-swirls are consistent with the presence of a Kelvin–Helmholtz instability during HPT processing where this may arise if there are local shear velocity gradients between adjacent positions within the HPT disks.


Shear Strain Friction Stir Welding Duplex Stainless Steel Helmholtz Instability Strain Gradient Plasticity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors express their great appreciation to the 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 U.S. DOE IPP program (Y.T.Z.), and the National Science Foundation of the United States [Grant No. DMR-0855009 (M.K. and T.G.L.)].


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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Y. Cao
    • 1
  • M. Kawasaki
    • 2
  • Y. B. Wang
    • 1
  • S. N. Alhajeri
    • 3
  • X. Z. Liao
    • 1
  • W. L. Zheng
    • 4
  • S. P. Ringer
    • 5
  • Y. T. Zhu
    • 6
  • T. G. Langdon
    • 2
    • 3
  1. 1.School of Aerospace, Mechanical and Mechatronic EngineeringThe University of SydneySydneyAustralia
  2. 2.Departments of Aerospace & Mechanical Engineering and Materials ScienceUniversity of Southern CaliforniaLos AngelesUSA
  3. 3.Materials Research Group, School of Engineering SciencesUniversity of SouthamptonSouthamptonUK
  4. 4.Shanghai Research Institute of MaterialsShanghaiChina
  5. 5.Australian Centre for Microscopy & MicroanalysisThe University of SydneySydneyAustralia
  6. 6.Department of Materials Science and EngineeringNorth Carolina State UniversityRaleighUSA

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