Grain Boundary Segregation in UFG Alloys Processed by Severe Plastic Deformation

Authors

  • Xavier Sauvage,

    Corresponding author
    1. Groupe de Physique des Matériaux, Faculté des Sciences, University of Rouen, CNRS UMR 6634, BP12, 76801 Saint-Etienne du Rouvray, France
    • University of Rouen, CNRS UMR 6634, Groupe de Physique des Matériaux, Faculté des Sciences, BP12, 76801 Saint-Etienne du Rouvray, France.

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  • Artur Ganeev,

    1. Institute for Physics of Advanced Materials, Ufa State Aviation Technical University, K. Marx 12, Ufa 450000, Russia
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  • Yulia Ivanisenko,

    1. Karlsruhe Institute of Technology, Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Deutschland, Germany
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  • Nariman Enikeev,

    1. Institute for Physics of Advanced Materials, Ufa State Aviation Technical University, K. Marx 12, Ufa 450000, Russia
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  • Maxim Murashkin,

    1. Institute for Physics of Advanced Materials, Ufa State Aviation Technical University, K. Marx 12, Ufa 450000, Russia
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  • Ruslan Valiev

    1. Institute for Physics of Advanced Materials, Ufa State Aviation Technical University, K. Marx 12, Ufa 450000, Russia
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  • One of the authors, Yu Ivanisenko, is thankful to DFG for funding support of a part of this investigation. The authors (A. Ganeev, R. Valiev, and M. Murashkin) are thankful to RFBR – 11-08-91330 for partial support of the investigation.

Abstract

Grain boundary (GB) segregations were investigated by atom probe tomography in an Al–Mg alloy, a carbon steel and Armco® Fe processed by severe plastic deformation (SPD). In the non-deformed state, the GBs of the aluminum alloy are Mg depleted, but after SPD some local enrichment up to 20 at% was detected. In the Fe-based alloys, large carbon concentrations were also exhibited along GBs after SPD. These experimental observations are attributed to the specific structure of GBs often described as “non-equilibrum” in ultra fine grained materials processed by SPD. The GB segregation mechanisms are discussed and compared in the case of substitutional (Mg in fcc Al) and interstitial (C in bcc Fe) solute atoms.

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