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Reappraisal of grain boundary diffusion creep equations for nanocrystalline materials

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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.

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Authors and Affiliations

  1. Division of Advanced Materials Science and Engineering, Hanbat National University, San 16-1, Deogmyeong-dong, Yuseong-gu, 305-719, Daejeon, Korea

    Kyung-Tae Park

  2. Department of Materials Science and Engineering, POSTECH, San 31, Hyoja-dong, Nam-gu, Pohang-si, 790-784, Gyeongbuk, Korea

    Chong Soo Lee

  3. Department of Metallurgy and Materials Science, Hanyang University, 1271, Sa 1-dong, Sangnok-gu, Ansan-si, 425-791, Gyeonggi, Korea

    Dong Hyuk Shin

  4. School of Mechanical and Automotive Engineering, Kookmin University, 861-1, Jeongneung-dong, Seongbuk-gu, 136-702, Seoul, Korea

    Yong Shin Lee

  5. School of Advanced Materials Engineering, Kookmin University, 136-702, Seoul, Korea

    Won Jong Nam

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  1. Kyung-Tae Park
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  2. Chong Soo Lee
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  3. Dong Hyuk Shin
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Correspondence to Kyung-Tae Park.

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Park, KT., Lee, C.S., Shin, D.H. et al. Reappraisal of grain boundary diffusion creep equations for nanocrystalline materials. Met. Mater. Int. 12, 107–113 (2006). https://doi.org/10.1007/BF03027465

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