Abstract
Ultrasonic oscillations of spall plates with a frequency of several MHz occur in the form of a standing wave. The reverberation of the plate is related to the ultrasound category with sufficiently large amplitudes of the vibrations. The periodic change of the compression–tension cycles, characteristic for oscillation processes, leads to the localization of the plastic deformation at the nodes of a standing wave. The self-healing effect is a consequence of the localized strain process: the interstitial elements and ultrafine particles of the alloying phase migrate from the matrix material into the zone of increasing spall destruction. The metal microstructure in the localized strain bands (LSBs) consists of a strongly deformed structureless material containing cup-shaped damage foci, 1 to 3 µm in size, with a large number of micropores. Physical and chemical processes, such as fragmentation, dissolution of the alloying phase particles, and carbidization, are responsible for the formation of the microstructure in the localization bands.
Published Version
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