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Metals and Materials International

, Volume 12, Issue 2, pp 107–113 | Cite as

Reappraisal of grain boundary diffusion creep equations for nanocrystalline materials

  • Kyung-Tae Park
  • Chong Soo Lee
  • Dong Hyuk Shin
  • Yong Shin Lee
  • Won Jong Nam
Article

Abstract

Grain boundary diffusion creep equations developed previously for nanocrystalline materials were reappraised in order to elicit further understanding of plastic deformation of these materials in relation to grain boundary diffusion. From a mechanistic viewpoint, the strain rate is inversely proportional to the second power of the grain size when the grain size is refined to the same order of the grain boundary thickness. The presence of the threshold stress appears to be inherent, as a relatively large volume fraction of the grain boundary region is associated with irregularities.

Keywords

nanocrystalline materials grain boundary diffusion creep grain size threshold stress 

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Copyright information

© Springer 2006

Authors and Affiliations

  • Kyung-Tae Park
    • 1
  • Chong Soo Lee
    • 2
  • Dong Hyuk Shin
    • 3
  • Yong Shin Lee
    • 4
  • Won Jong Nam
    • 5
  1. 1.Division of Advanced Materials Science and EngineeringHanbat National UniversityDaejeonKorea
  2. 2.Department of Materials Science and EngineeringPOSTECHGyeongbukKorea
  3. 3.Department of Metallurgy and Materials ScienceHanyang UniversityGyeonggiKorea
  4. 4.School of Mechanical and Automotive EngineeringKookmin UniversitySeoulKorea
  5. 5.School of Advanced Materials EngineeringKookmin UniversitySeoulKorea

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