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Stability of the ultrafine-grained microstructure in silver processed by ECAP and HPT

  • Nanostructured Materials
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Abstract

The high-temperature thermal stability of the ultrafine-grained (UFG) microstructures in low stacking fault energy silver was studied by differential scanning calorimetry (DSC). The UFG microstructures were achieved by equal-channel angular pressing (ECAP) and high-pressure torsion (HPT) at room temperature (RT). The defect structure in the as-processed samples was examined by electron microscopy and X-ray line profile analysis. The stored energy calculated from the defect densities was compared to the heat released during DSC. The sum of the energies stored in grain boundaries and dislocations in the ECAP-processed samples agreed with the heat released experimentally within the experimental error. The temperature of the DSC peak maximum decreased while the released heat increased with increasing numbers of ECAP passes. The released heat for the specimen processed by one revolution of HPT was much smaller than after 4–8 passes of ECAP despite the 2 times larger dislocation density measured by X-ray line profile analysis. This dichotomy was caused by the heterogeneous sandwich-like microstructure of the HPT-processed disk: about 175 μm wide surface layers on both sides of the disk exhibited a UFG microstructure while the internal part was recrystallized, thereby yielding a relatively small released heat.

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Acknowledgements

This study was supported in part by the Hungarian Scientific Research Fund, OTKA, Grant No. K-81360, in part by the National Science Foundation of the United States under Grant No. DMR-1160966 (MK and TGL) and in part by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS (TGL). The authors thank Ms. Noémi Szász for preparation of the TEM samples as well as Dr. Zoltán Dankházi, Dr. Károly Havancsák and Mr. Gábor Varga for performing SEM/EBSD experiments. The help of Mr. Péter Szommer in nanohardness experiments is also acknowledged.

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Authors and Affiliations

  1. Department of Materials Physics, Eötvös Loránd University, Pázmány Péter s. 1/A, 1117, Budapest, Hungary

    Zoltán Hegedűs, Jenő Gubicza & Nguyen Q. Chinh

  2. Departments of Aerospace and Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA, 90089-1453, USA

    Megumi Kawasaki & Terence G. Langdon

  3. Division of Materials Science and Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, South Korea

    Megumi Kawasaki

  4. Research Institute for Technical Physics and Materials Science, Research Centre for Natural Sciences, Hungarian Academy of Sciences, P.O. Box 49, 1525, Budapest, Hungary

    János L. Lábár

  5. Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton, SO17 1BJ, UK

    Terence G. Langdon

Authors
  1. Zoltán Hegedűs
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  2. Jenő Gubicza
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  3. Megumi Kawasaki
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  4. Nguyen Q. Chinh
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  5. János L. Lábár
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  6. Terence G. Langdon
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Corresponding author

Correspondence to Jenő Gubicza.

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Hegedűs, Z., Gubicza, J., Kawasaki, M. et al. Stability of the ultrafine-grained microstructure in silver processed by ECAP and HPT. J Mater Sci 48, 4637–4645 (2013). https://doi.org/10.1007/s10853-012-7124-5

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  • DOI: https://doi.org/10.1007/s10853-012-7124-5

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