Abstract
Creep tests and scanning electron microscopy (SEM) observation of grain boundary cavitation are made to decide the most likely mechanism which rate-controls the power law creep at high temperatures in powder metallurgy tungsten wires. The modified Monkman-Grant relation holds for the overall time, the strain to fracture and the minimum creep rate during creep. The activation energy for steady state creep is obtained to be about 130 kJ/mol which is much less than the energies for surface, dislocation, grain boundary and lattice diffusion of tungsten. The value does not approach the activation energy for lattice diffusion as the mechanism of dislocations climb even if the effect of grain boundary cavitation on creep rates is taken into account
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