Recent Findings in Superior Strength and Ductility of Ultrafine-Grained Materials

  • Valiev Ruslan Z.
    Institute of Physics of Advanced Materials, Ufa State Aviation Technical University Laboratory for Mechanics of Bulk Nanomaterials, Saint Petersburg State University
  • Zhu Yuntian
    School of Materials Science and Engineering, Nanjing University of Science and Technology Department of Materials Science and Engineering, North Carolina State University


Over the last two decades it was well documented that the formation of ultrafine-grained (UFG) structures with the grain sizes in submicron (< 1 μm) or nanometer (< 100 nm) range in metallic materials increases strength but typically also leads to decrease in ductility. However, recent studies demonstrated that extraordinarily high strength and enhanced ductility can be obtained in the UFG metals and alloys when it is possible to control not only grain sizes but also the formation of various nanostructured elements, such as nanoparticles, nanotwins and grain boundary structures (states) by means of severe plastic deformation (SPD) techniques. These new trends applied to different metallic materials with superior strength and high ductility are considered and discussed in the present paper.


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