Abstract
Abstract : Aluminum bicrystals 99.99% pure having a pure tilt boundary about the less than 110 greater than axis were subjected to different stresses at various temperatures. The relative boundary displacements were observed for constant stresses. The initial rate of grain boundary gliding was found to be almost linear and a plot of the logarithm of the initial rate versus the reciprocal of the absolute temperature resulted in a series of parallel straight lines. The usual rate equation r = A sub e -Q/RT was used to calculate the activation energy for grain boundary shear. It was found to increase continuously as the boundary angle increased, and approached a maximum value for the maximum angle of mis-orientation. The mechanism for grain boundary shear was considered to be a combination process involving grain boundary self-diffusion associated with grain boundary slip (stress relaxation).
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