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Ductility of ultrafine-grained copper processed by equal-channel angular pressing

  • Yonghao Zhao , Ying Li , Troy D. Topping , Xiaozhou Liao , Yuntian Zhu , Ruslan Z. Valiev and Enrique J. Lavernia
Published/Copyright: June 11, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 100 Issue 12

Abstract

In a previous study (R.Z. Valiev et al.: J. Mater. Res. 17 (2002) 5), unusual combinations of yield strength and ductility in ultrafine grained copper processed by equal-channel angular pressing of 360 MPa 23 % (by Bc route two passes) and 380 MPa 55 % (by Bc route 16 passes) were reported. However, results from recent work suggest that the tensile strain, when measured using a non-standard method and miniature dog-bone tensile specimens, is likely to contain significant errors. In this study, by implementing a standard strain measurement and tensile specimens with geometries that meet the ASTM requirements, we report yield strength and ductility combinations of 370 MPa 9 % (Bc 2 passes) and 370 MPa 16 % (Bc 16 passes) in the ultrafine grained copper. The higher ductility of the ultrafine grained copper processed by route Bc 16 passes was rationalized on the basis of several factors including the presence of equiaxed grains, lower dislocation density and higher fraction of high-angle grain boundaries (which result in larger strain rate sensitivity and strain hardening).

Keywords: Ultrafine grained copper; Standard mechanical testing; Ductility; Microstructure
* Correspondence address, Yonghao Zhao, Ph.D., Assistant Project Scientist, Dept. Chemical Engineering and Materials Science, University of California, Davis, 1231 Bainer Hall, One Shields Avenue, Davis, CA 95616-5294, Tel./Fax: 530-752-9568/9554, E-mail:

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Received: 2009-4-22
Accepted: 2009-8-21
Published Online: 2013-06-11
Published in Print: 2009-12-01

© 2009, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Review of IJMR's centenary year
  5. Proceedings of the SPD Workshop, Melbourne, June 2009
  6. Feature
  7. Processing by severe plastic deformation:an ancient skill adapted for the modern world
  8. Review
  9. Grain refinement and growth induced by severe plastic deformation
  10. Basic
  11. The nature of grain refinement in equal-channel angular pressing: a comparison of representative fcc and hcp metals
  12. Ductility of ultrafine-grained copper processed by equal-channel angular pressing
  13. Technical parameters affecting grain refinement by high pressure torsion
  14. Nanocrystalline body-centred cubic beta-titanium alloy processed by high-pressure torsion
  15. Softening of high purity aluminum and copper processed by high pressure torsion
  16. An atom probe characterisation of grain boundaries in an aluminium alloy processed by equal-channel angular pressing
  17. Deformation mechanisms in an ultra-fine grained Al alloy
  18. Applied
  19. The effect of back pressure on mechanical properties of an Mg-3 wt.% Al-1 wt.% Zn alloy with single pass equal channel angular pressing
  20. Nanostructuring of Ti-alloys by SPD processing to achieve superior fatigue properties
  21. Improvement in the strength and ductility of Al-Mg-Mn alloys with Zr and Sc additions by equal channel angular pressing
  22. The effect of initial microstructure and processing temperature on microstructure and texture in multilayered Al/Al(Sc) ARB sheets
  23. Plastic deformation analysis of accumulative back extrusion
  24. The possibility of synthesizing bulk nanostructured or ultrafine structured metallic materials by consolidation of powders using high strain powder compact forging
  25. Use of residual hydrogen to produce CP-Ti powder compacts for low temperature rolling
  26. Mg alloy for hydrogen storage processed by SPD
  27. DGM News
  28. Personal/Conferences/Imprint
https://doi.org/10.3139/146.110232
Keywords for this article
Ultrafine grained copper; Standard mechanical testing; Ductility; Microstructure

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Review of IJMR's centenary year
  5. Proceedings of the SPD Workshop, Melbourne, June 2009
  6. Feature
  7. Processing by severe plastic deformation:an ancient skill adapted for the modern world
  8. Review
  9. Grain refinement and growth induced by severe plastic deformation
  10. Basic
  11. The nature of grain refinement in equal-channel angular pressing: a comparison of representative fcc and hcp metals
  12. Ductility of ultrafine-grained copper processed by equal-channel angular pressing
  13. Technical parameters affecting grain refinement by high pressure torsion
  14. Nanocrystalline body-centred cubic beta-titanium alloy processed by high-pressure torsion
  15. Softening of high purity aluminum and copper processed by high pressure torsion
  16. An atom probe characterisation of grain boundaries in an aluminium alloy processed by equal-channel angular pressing
  17. Deformation mechanisms in an ultra-fine grained Al alloy
  18. Applied
  19. The effect of back pressure on mechanical properties of an Mg-3 wt.% Al-1 wt.% Zn alloy with single pass equal channel angular pressing
  20. Nanostructuring of Ti-alloys by SPD processing to achieve superior fatigue properties
  21. Improvement in the strength and ductility of Al-Mg-Mn alloys with Zr and Sc additions by equal channel angular pressing
  22. The effect of initial microstructure and processing temperature on microstructure and texture in multilayered Al/Al(Sc) ARB sheets
  23. Plastic deformation analysis of accumulative back extrusion
  24. The possibility of synthesizing bulk nanostructured or ultrafine structured metallic materials by consolidation of powders using high strain powder compact forging
  25. Use of residual hydrogen to produce CP-Ti powder compacts for low temperature rolling
  26. Mg alloy for hydrogen storage processed by SPD
  27. DGM News
  28. Personal/Conferences/Imprint
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