This work attempts to evaluate the sintering mechanisms of ball milled nanocrystalline nickel during nonisothermal heating. Samples showed a sintered density of 91.2% (theoretical) and grain growth up to 414 nm at 1273K. The activation energies of 12.4, 32.0 and 51.6 kJ/mol were found for viscous flow, lattice diffusion and grain boundary diffusion mechanisms respectively. Sintering was found to be controlled by interface reactions involving surface and grain boundary diffusions.

Bharat Bhooshan Panigrahi

Department of Materials Science and Metallurgical Engineering

K. Das

M.M. Godkhindi

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Journal	Science of Sintering
ISSN	0350820X