Abstract
Formation of macrolocalized deformation bands under conditions of serrated creep is studied by methods of acoustic emission (AE) and high-speed video recording. It is established that the fastest stages of the deformation band formation, which are related to the emergence of a band on the surface with subsequent accelerated expansion, are accompanied by generating a burst of an AE signal in the band of ∼0.05–1 MHz. Hidden correlations in the complex structure of the acoustic burst were studied by methods of statistical and fractal analysis. The relation between the acoustic burst envelope and variation rate of the force response caused by the formation of an individual deformation band is established.
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Funding
The complex high-speed experimental in situ studies of the dynamics of deformation bands were supported in part by the Russian Science Foundation, project no. 18-19-00304. The statistical and fractal analysis of acoustic signals was supported by the Russian Foundation for Basic Research, project no. 19-08-00395.
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Translated by A. Nikol’skii
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Shibkov, A.A., Zheltov, M.A., Gasanov, M.F. et al. Studying High-Frequency Acoustic Emission during Discontinuous Creep in an Aluminum–Magnesium Alloy. Tech. Phys. 65, 1622–1629 (2020). https://doi.org/10.1134/S1063784220100199
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DOI: https://doi.org/10.1134/S1063784220100199