Heterogeneous Process of Disordering and Structural Refinement in Ni<SUB>3</SUB>Al during Severe Plastic Deformation by High-Pressure Torsion

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  • Ciuca Octav
    Department of Production Systems Engineering, Toyohashi University of Technology
  • Tsuchiya Koichi
    Department of Production Systems Engineering, Toyohashi University of Technology Hybrid Materials Center, National Institute for Materials Science
  • Yokoyama Yoshihiko
    Institute for Materials Research, Tohoku University
  • Todaka Yoshikazu
    Department of Production Systems Engineering, Toyohashi University of Technology
  • Umemoto Minoru
    Department of Production Systems Engineering, Toyohashi University of Technology

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Other Title
  • Heterogeneous process of disordering and structural refinement in Ni3Al during severe plastic deformation by high-pressure torsion
  • Effect of nanocrystallization and twinning on hardness in Ni3Al deformed by high-pressure torsion

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Description

The process of grain refinement in Ni3Al by high-pressure torsion (HPT) was investigated up to 100 turns. The entire diametric sections of the deformed samples were analyzed by optical microscopy and image processing methods in order to evaluate both the spatial distribution and the volume fractions of the nanocrystalline and coarse grains. A thick band of nanocrystalline phase was formed in the middle section of the samples, and a structure containing mainly coarser ordered fragments was present in the vicinity of the top and bottom surfaces. Pseudo-twinning along {111} was observed at the boundaries of coarse-fragmented grains as well as the inside of the fragments and is put forward as a possible mechanism for disordering and nanocrystalline structure formation in Ni3Al.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 51 (1), 14-22, 2010

    The Japan Institute of Metals and Materials

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