The Effect of Temperature on Creep Behaviour of Porous (1 at.%) Nano Crystalline Nickel
M Meraj and S Pal, TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS, 69, 277-282 (2016).
Creep behaviour of porous (porosity similar to 1 at.%) nano crystalline (NC) Ni having ultra-fine grain (grain size similar to 4 nm) has been investigated using molecular dynamics simulation for a specific stress 1 GPa and different temperatures (e.g. 1140, 1150, and 1160 K) using embedded atom method potential. It is revealed from uniaxial tensile creep simulation that all the simulated creep curves have extensive and significant primary creep and tertiary creep parts but hardly possess the steady state creep deformation regime. Mean square displacement is also calculated for evaluating diffusivity. Nano-scale simulation shows that the creep deformation of porous nano crystalline Ni is significantly governed by grain-boundary diffusion. The effect of temperatures on creep behaviour and evaluation of atomic configuration is prominent for the study which is also logically supported based on the features of radial distribution function plots. The ultra-fine grained porous NC Ni become amorphous with the progress of creep deformation.
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