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Effect of electric-current pulses on grain-structure evolution in cryogenically rolled copper

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Abstract

The effect of electric-current pulses on the evolution of microstructure and texture in cryogenically rolled copper was determined. The pulsed material was found to be completely recrystallized, and the recrystallization mechanism was deduced to be similar to that operating during conventional static annealing. The microstructural changes were explained simply in terms of Joule heating. A significant portion of the recrystallization process was concluded to have occurred after pulsing; i.e., during cooling to ambient temperature. The grain structure and microhardness were shown to vary noticeably in the heat-affected zone (HAZ); these observations mirrored variations of temper colors. Accordingly, the revealed microstructure heterogeneity was attributed to the inhomogeneous temperature distribution developed during pulsing. In the central part of the HAZ, the mean grain size increased with current density and this effect was associated with the temperature rise per se. This grain size was slightly smaller than that in statically recrystallized specimens.

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ACKNOWLEDGMENTS

The authors thank Dr. R.M. Galeyev and Dr. O.R. Valiakhmetov for graciously providing the material used in this work, and P. Klassman and T.I. Nazarova for technical assistance during cryogenic rolling. One of the authors (AVK) would like to acknowledge the Tomsk State University Competitiveness Improvement Program for financial support.

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Authors and Affiliations

  1. Institute for Metals Superplasticity Problems, Russian Academy of Science, Ufa, 450001, Russia

    Tatyana Konkova, Irshat Valeev, Sergey Mironov & Alexander Korznikov

  2. Department of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan

    Sergey Mironov

  3. National Research Tomsk State University, Tomsk, 634050, Russia

    Alexander Korznikov

  4. Baikov Institute of Metallurgy and Material Science, Russian Academy of Science, Moscow, 119991, Russia

    Michail Myshlyaev

  5. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    Michail Myshlyaev

  6. Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/RXCM, Wright-Patterson AFB, Ohio, 45433-7817, USA

    S. Lee Semiatin

Authors
  1. Tatyana Konkova
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  2. Irshat Valeev
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  3. Sergey Mironov
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  4. Alexander Korznikov
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  5. Michail Myshlyaev
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  6. S. Lee Semiatin
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Correspondence to Sergey Mironov.

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Konkova, T., Valeev, I., Mironov, S. et al. Effect of electric-current pulses on grain-structure evolution in cryogenically rolled copper. Journal of Materials Research 29, 2727–2737 (2014). https://doi.org/10.1557/jmr.2014.299

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  • DOI: https://doi.org/10.1557/jmr.2014.299

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