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Microplasticity Detected by an Acoustic Technique
Summary
This materials science paper describes an acoustic technique that detects microplastic deformation events — tiny slip occurrences within metal crystals during loading — by monitoring longitudinal oscillations. 'Microplasticity' here refers to microscale plastic deformation in crystalline materials and is unrelated to environmental plastic pollution.
Evidence for the formation of slip lines and slip bands has usually been obtained from slip-line replica and etch-pit techniques. An apparatus has been built to detect the formation of small slip events within a crystal by monitoring small longitudinal oscillations of the test specimen which occur when the load is momentarily relaxed. Each load drop results in a burst of acoustic energy, some of which are detected and recorded electronically. Results are presented of measurements of the frequency and magnitude of acoustic pulses from single-crystal specimens during plastic flow. They suggest that slip events occur cooperatively and that dislocation velocities during yielding may be as high as 10 3 cm/sec.
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