Abstract
High-frequency (15-kHz) low-strain fatigue measurements have been carried out on high-purity polycrystalline aluminum, using a piezoelectrically driven exponential horn. The data show that ``channeling, similar to that observed in the deformation of irradiated metals, occurs prior to fatigue failure. Estimates show that the point-defect concentration produced during high-frequency fatigue can easily reach the critical concentration necessary for channel formation which has been found for irradiated metals. These observations suggest, therefore, that point defects may also play a critical role in the mechanisms of normal low-frequency fatigue processes.
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