Recrystallization and Grain Growth in Ultrafine-Grained Materials Produced by High Pressure Torsion

Authors

  • Anahita Khorashadizadeh,

    1. Max-Planck-Institut für Eisenforschung GmbH, Department Microstructure Physics and Metal Forming, Düsseldorf, (Germany)
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  • Dierk Raabe,

    1. Max-Planck-Institut für Eisenforschung GmbH, Department Microstructure Physics and Metal Forming, Düsseldorf, (Germany)
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  • Myrjam Winning,

    Corresponding author
    1. Max-Planck-Institut für Eisenforschung GmbH, Department Microstructure Physics and Metal Forming, Düsseldorf, (Germany)
    • Max-Planck-Institut für Eisenforschung GmbH, Department Microstructure Physics and Metal Forming, Düsseldorf, (Germany).
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  • Reinhard Pippan

    1. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences and Department Material Physics, Leoben, (Austria)
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  • The authors would like to thank the Deutsche Forschungsgemeinschaft (DFG) for financial support through the research unit “Mechanical properties and interfaces in ultrafine-grained materials” (TP 2-Wi 1917/6). One of the authors (MW) gratefully acknowledges the financial support by the Deutsche Forschungsgemeinschaft through the Heisenberg program (Wi 1917/4).

Abstract

Ultrafine-grained (UFG) materials processed by severe plastic deformation are known to exhibit good mechanical properties. Much about the annealing behavior of such materials is still unknown, and this work aims to provide a better understanding of the thermal properties of UFG materials. For this purpose a Cu–0.17 wt%Zr alloy was subjected to high pressure torsion (HPT) with a maximal pressure of 4.8 GPa at room temperature. The microstructures of the specimens were characterized using electron back scatter (EBSD) measurements, transmission electron microscopy (TEM), and hardness measurements. During annealing of the samples, dispersoids were formed which improved the thermal stability of the alloy. At higher strain levels the fraction of high angle grain boundaries (HAGBs) increased above 70% of the total grain boundaries.

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