Strain-rate dependence of acoustic-emission power and spectra in aluminum alloys

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Abstract
Strain‐rate dependence of acoustic‐emission power and spectra for deformation of aluminum alloys is investigated over a wide frequency range of 100 kHz to 4 MHz. In case of Al‐Cu‐Mg alloy (2024) and pure aluminum (1100), it is found that acoustic‐emission power is proportional to the first power of the plastic strain rate times the gauge length of the specimen. Normalized acoustic‐emission power spectra show no significant change at a given strain depending on the strain rate, though they vary with the strain in early stages of deformation. In case of Al‐Mg alloy (5056), repeated bursts of acoustic emission are recorded accompanied by repeated discontinuous yielding. The mode of inhomogeneous deformation and the pattern of acoustic emission vary with the strain rate.

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