Creep in boron-doped nanocrystalline nickel

When fully-dense nanocrystalline nickel was doped with a small amount of boron, 700 wt. ppm, the tensile strength increased mildly at room temperature compared to that of pure nano-nickel. At 373K, the strength remains relatively high in the boron-doped nano-nickel as opposed to significant deterior...

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Bibliographic Details
Published in:Scripta materialia 2001-03, Vol.44 (4), p.569-574
Main Authors: Yin, W M, Whang, S H
Format: Article
Language:English
Online Access:Get full text
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Summary:When fully-dense nanocrystalline nickel was doped with a small amount of boron, 700 wt. ppm, the tensile strength increased mildly at room temperature compared to that of pure nano-nickel. At 373K, the strength remains relatively high in the boron-doped nano-nickel as opposed to significant deterioration in that of nano-nickel. The creep mechanism in boron-doped nano-nickel appears to be a Coble type mechanism at room temperature, the creep rate is much lower than that of pure nano-nickel. Similarly, at 373K and 437K, the creep rate of the boron-doped nano-Ni is 0.5-1.0 order of magnitude smaller than that of pure nano-nickel. In Coble creep, the grain boundary/intercrystalline components play a major role in the deformation. As a result, the creep rate reduction in the boron-doped nano-Ni appears to be due to the effect of boron on deformation of the intercrystalline components.
ISSN:1359-6462
DOI:10.1016/S1359-6462(00)00639-4