Polycrystalline Cu3Au has been fatigued at 95 c/s at temperatures above and below the critical temperature, 386°C. Grain-boundary cavities were observed in both ordered and disordered specimens, the cavitation in all cases being more pronounced on boundaries experiencing the maximum shear stress. The rate of cavity nucleation and growth was slower in ordered specimens, resulting in an increase in the fatigue life. The experiments suggest that cavities are nucleated by grain-boundary sliding and grow by absorbing vacancies from the grains.
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