Metallurgical and Materials Transactions A

, Volume 36, Issue 7, pp 1927–1936

Nanostructured Ni-Co alloys with tailorable grain size and twin density

  • B. Y. C. Wu
  • C. A. Schuh
  • P. J. Ferreira
Article

DOI: 10.1007/s11661-005-0056-9

Cite this article as:
Wu, B.Y.C., Schuh, C.A. & Ferreira, P.J. Metall and Mat Trans A (2005) 36: 1927. doi:10.1007/s11661-005-0056-9

Abstract

We present an experimental approach to systematically produce nanostructures with various grain sizes and twin densities in the Ni-Co binary system. Using electrodeposition with various applied current densities and organic additive contents in the deposition bath, we synthesize nanostructured fcc and hcp solid solutions with a range of compositions. Due to the low stacking fault energy (SFE) of these alloys, growth twins are readily formed during deposition, and by adjusting the deposition conditions, a range of twin boundary densities is possible. The resulting nanostructured alloys cannot be described by a single characteristic length scale, but instead must be characterized in terms of (1) a true grain size pertaining to general high-angle grain boundaries and (2) an effective grain size that incorporates twin boundaries. Analysis of Hall-Petch strength scaling for these materials is complicated by their dual length scales, but the hardness trends found in Ni-80Co are found to be roughly in line with those seen in pure nanocrystalline nickel.

Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2005

Authors and Affiliations

  • B. Y. C. Wu
    • 1
  • C. A. Schuh
    • 1
  • P. J. Ferreira
    • 2
  1. 1.the Department of Materials Science and EngineeringMassachusetts Institute of TechnologyCambridge
  2. 2.the Materials Science and Engineering ProgramUniversity of Texas at AustinAustin

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