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

B. Y.C. Wu*, P. J. Ferreira, C. A. Schuh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

90 Scopus citations


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 fee 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.

Original languageEnglish (US)
Pages (from-to)1927-1936
Number of pages10
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Issue number7
StatePublished - Jul 2005

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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