Review on Grain Size- and Grain Boundary Phenomenon in Unusual Mechanical Behavior of Ultrafine-Grained Al Alloys

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  • Chinh Nguyen Q.
    Department of Materials Physics, Eötvös Loránd University
  • Olasz Dániel
    Department of Materials Physics, Eötvös Loránd University Institute for Technical Physics and Materials Science, Centre for Energy Research
  • Ahmed Anwar Q.
    Department of Materials Physics, Eötvös Loránd University College of Science, University of Kufa
  • Bobruk Elena V.
    Institute of Physics of Advanced Materials, Ufa University of Science and Technology
  • Valiev Ruslan Z.
    Institute of Physics of Advanced Materials, Ufa University of Science and Technology Laboratory for Dynamics and Extreme Performance of Advanced Nanostructured Materials, Saint Petersburg State University

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Abstract

<p>In the last three decades, several severe plastic deformation (SPD) procedures have been developed and applied in materials science to create bulk, ultrafine-grained (UFG) structures. As a consequence of the SPD, not only submicron and even nanometer grain sizes can be obtained, but also new grain boundaries with non-equilibrium structures in a material may be formed. Therefore, both the strength and ductility of the UFG materials can change significantly compared to the coarse-grained counterparts. This review is focused on unusual mechanical behaviors of UFG Al and Al alloys, associated with grain boundary structure and segregations which are responsible for the modification of the Hall-Petch relationship and the so-called size-effect for UFG structure. Unusually high strain rate sensitivity, intensive grain boundary sliding and superplasticity at low temperature are described and surveyed. In addition, innovation potential of these phenomena is also briefly considered.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 64 (8), 1844-1855, 2023-08-01

    The Japan Institute of Metals and Materials

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