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High temperature thermal stability of ultrafine-grained silver processed by equal-channel angular pressing

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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 in two samples having purity levels of 99.995 and 99.99 at.% were achieved by four passes of equal-channel angular pressing at room temperature. The defect structure was studied by electron microscopy, X-ray line profile analysis, and positron annihilation spectroscopy before and after the exothermic DSC peak related to recovery and recrystallization. The heat released in the DSC peak was correlated to the change of defect structure during annealing. It was found for both compositions that a considerable fraction of stored energy (~15–20 %) was retained in the samples even after the DSC peak due to the remaining UFG regions and a large density of small dislocation loops in the recrystallized volumes. The larger impurity level in Ag yielded a higher temperature of recrystallization and a lower released heat. The latter observation is explained by the much lower vacancy concentration before the DSC peak which is attributed to the segregation of dopants at grain boundaries resulting in a smaller free volume in the interfaces.

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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-0855009 (MK and TGL) and in part by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS (TGL). The European Union and the European Social Fund have provided financial support to this project under Grant Agreement No. TÁMOP 4.2.1./B-09/1/KMR-2010-0003. The authors thank Andrea Jakab for preparation of the TEM samples and Zoltán Dankházi for evaluating the EBSD results.

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Authors and Affiliations

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

    Zoltán Hegedűs, Jenő Gubicza & Nguyen Q. Chinh

  2. Departments of Aerospace & 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. Laboratory of Nuclear Chemistry, Eötvös Loránd University, Pázmány Péter s. 1/A, Budapest, 1117, Hungary

    Károly Süvegh

  5. Research Institute for Technical Physics and Materials Science, Budapest, P.O. Box 49, 1525, Hungary

    Zsolt Fogarassy

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

    Terence G. Langdon

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  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. Károly Süvegh
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Correspondence to Jenő Gubicza.

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Hegedűs, Z., Gubicza, J., Kawasaki, M. et al. High temperature thermal stability of ultrafine-grained silver processed by equal-channel angular pressing. J Mater Sci 48, 1675–1684 (2013). https://doi.org/10.1007/s10853-012-6926-9

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  • DOI: https://doi.org/10.1007/s10853-012-6926-9

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