Nanostructured Ni-Co alloys with tailorable grain size and twin density |
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Authors: | B Y C Wu C A Schuh P J Ferreira |
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Affiliation: | (1) the Department of Materials Science and Engineering, Massachusetts Institute of Technology, 02139 Cambridge, MA;(2) the Materials Science and Engineering Program, University of Texas at Austin, 78712 Austin, TX |
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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. |
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