The effect of porosity and void on creep behavior of ultra-fine grained nano crystalline nickel

M Meraj and N Yedla and S Pal, MATERIALS LETTERS, 169, 265-268 (2016).

DOI: 10.1016/j.matlet.2016.01.128

Molecular dynamics (MD) study of nano crystalline (NC) Ni having grain size similar to 4 nm with and without presence of porosity (porosity similar to 1 at%) and void in center (diameter similar to 0.3 nm) has been performed separately using embedded atom method (EAM) potential. All the simulated creep curves have extensive primary creep and tertiary creep regimes, and existence of steady state creep deformation is hardly evident. The MD study reveals that the grain boundary diffusion is the governing mechanism of creep deformation in ultra-fine grained (similar to 4 nm) nano crystalline Ni and the presence of porosity even if 1 at%, deteriorates creep properties of NC Ni more significantly compared to the presence of single small void in the center of NC Ni. (C) 2016 Elsevier B.V. All rights reserved.

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