The effect of fatigue stressing on the diffusion rate of zinc in aluminium

Experiments have been made to find the effect of fatigue stressing on the diffusion rate of zinc in aluminium and in an aluminium-20% zinc alloy. Diffusion measurements were made on unstressed specimens and on specimens which were being fatigued in the temperature range 300°c-375°c. The results show that only small changes, at most, were produced in the diffusion rates despite the very high plastic strain rates (approximately 144 per hour) given by the fatigue stressing.