Abstract
Creep of a polycrystalline solid was modelled by attributing a Newtonian-viscosity to the grain boundaries and a power-law creep viscosity to the grain interior. A finite-element computational method then gave the flow field within the polycrystal and the macroscopic stress/strain-rate behaviour. At high strain rates, the polycrystal flows according to the power law of the grains. At low strain rates, it again flows according to this power law, accelerated somewhat by grain boundary sliding. The transition from power-law to accelerated-power-law behaviour occurs at a transitional strain rate which can be calculated. The results are formulated in a way that allows approximate prediction of the creep behaviour of any polycrystal, and are displayed on deformation mechanism maps. The computation is related to, and consistent with, early work by Brunner and Grant, and Hart.
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