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Journal of Materials Science

, Volume 47, Issue 22, pp 7828–7834 | Cite as

Nanoindentation analysis for local properties of ultrafine grained copper processed by high pressure torsion

  • Hyeok Jae Jeong
  • Eun Yoo Yoon
  • Dong Jun Lee
  • Nack Joon Kim
  • Sunghak Lee
  • Hyoung Seop Kim
Ultrafine Grained Materials

Abstract

Severe plastic deformation (SPD) techniques have recently been developed for producing bulk ultrafine grained metallic materials. High pressure torsion (HPT) produces finer microstructures than those achieved by other SPD processes because of the higher imposed strain and hydrostatic pressure. It is known that HPT-processed metals show a highly heterogeneous microstructure not only along the radius due to the nature of torsional deformation but also through the thickness. Since the sample size for HPT is small, the local properties of HPT-processed specimens have not been investigated yet. In this paper, we propose a method to obtain stress–strain curves from nanoindenting curves by combining the finite element method and the recursion method. The nanoindentation technique was employed to elucidate the local mechanical properties, especially the stress–strain behavior. The method to extract the stress–strain curves from the load–displacement curves obtained by nanoindentation tests was applied to the edge region of the HPT-processed sample. The extracted properties correlated well with experimental results qualitatively.

Keywords

Displacement Curve Effective Strain Edge Region High Pressure Torsion Finite Element Method Result 
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.

Notes

Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2010-0026981).

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Hyeok Jae Jeong
    • 1
  • Eun Yoo Yoon
    • 1
  • Dong Jun Lee
    • 1
  • Nack Joon Kim
    • 2
  • Sunghak Lee
    • 1
    • 3
  • Hyoung Seop Kim
    • 1
    • 3
  1. 1.Department of Materials Science and EngineeringPohang University of Science and Technology (POSTECH)PohangSouth Korea
  2. 2.Graduate Institute of Ferrous TechnologyPohang University of Science and Technology (POSTECH)PohangSouth Korea
  3. 3.Center for Advanced Aerospace MaterialsPohang University of Science and Technology (POSTECH)PohangSouth Korea

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