Correlation wave effects for elementary deformation events during high-temperature loading of aluminum and its alloys

We report on the results of experiments on straining of aluminum and its alloys in conditions of mechanical loading and high temperatures. It is established that deformation accumulates in such conditions as a monotonic and abrupt process accompanied by monotonic and pulsed acoustic emission. It is found that the main contribution to strain accumulation comes from deformation jumps accompanied with not only acoustic emission, but also mechanical stress oscillation. The mechanical stress oscillation indicates rapid processes of strengthening and softening of metal materials. Spectral analysis of a series of acoustic emission signals indicates that in the course of strain accumulation, the volume being deformed is a natural resonator in which primary acoustic emission signals are transformed into a low-temperature spectrum of standing acoustic waves executing the correlation of elementary deformation events on a macroscopic scale, where the correlation scale is determined by the wavelength of a standing wave.