Abstract
In this paper, results of a study of acoustic emission frequency spectra obtained during accumulation of deformation in an aluminum-magnesium alloy under thermo-mechanical loading from room temperature up to 5500С are presented. The spectra of acoustic emission signals are analyzed for the conditions of active deformation accumulation: the monotonic accumulation - in the region of low temperatures (up to a temperature of deformation and structural transition), and the quasi step-like accumulation - in the high-temperature region. Analysis of spectral density of acoustic emission signals indicates the redistribution of the vibrational energy of the primary acoustic signal by the resonant vibrations of the standing shear and longitudinal waves of the resonator, the geometry of which corresponds to the region of deformation localization (sample flow). It is shown that no resonances are formed in the selected resonant frequencies in the spectrum of signals at monotonic accumulation of deformation before the structural transition (in the region of low temperatures). In the high-temperature region of the quasi step-like accumulation of deformation, noticeable energy of oscillations of standing waves (both for shear and longitudinal waves) is accumulated in the resonator. In the crystal medium, the oscillations of the standing wave activate elementary deformation shifts in a certain volume, which is associated with the length of the standing wave, which determines the macroscopic scale of the correlation.
Highlights
Results of a study of acoustic emission frequency spectra obtained during accumulation of deformation in an aluminum-magnesium alloy under thermo-mechanical loading from room temperature up to 5500С are presented
The spectra of acoustic emission signals are analyzed for the conditions of active deformation accumulation: the monotonic accumulation — in the region of low temperatures, and the quasi step-like accumulation — in the high-temperature region
Analysis of spectral density of acoustic emission signals indicates the redistribution of the vibrational energy of the primary acoustic signal by the resonant vibrations of the standing shear and longitudinal waves of the resonator, the geometry of which corresponds to the region of deformation localization
Summary
Results of a study of acoustic emission frequency spectra obtained during accumulation of deformation in an aluminum-magnesium alloy under thermo-mechanical loading from room temperature up to 5500С are presented. Целью работы является исследование эволюции спектральной плотности акустической эмиссии в ходе накопления деформации в алюминиево-магниевом сплаве в условиях термомеханического нагружения. 1, область 1), чему соответствует монотонная акустическая эмиссия, и квазискачкообразно в высокотемпературной области 2 (в интервале 450–550 0С), в которой наблюдается значительный рост среднеквадратичного напряжения акустической эмиссии.
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