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High-Speed In Situ Study of the Correlation between the Deformation Bands Formation and Acoustic Response in Al-Mg Alloy
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机译：High-Speed In Situ Study of the Correlation between the Deformation Bands Formation and Acoustic Response in Al-Mg Alloy
The dynamics of deformation bands in Al-Mg alloy has been investigated synchronously in situ by two methods: acoustic emission (AE) and high-speed (20000 fps) video recording of a sample surface deformed at a specified stress rate. It is established that a band nucleates at a random site on the lateral surface of planar sample and grows in the form of a needle-shaped embryo band at an angle of about 60 degrees with respect to the extension axis, with a tip velocity of up to similar to 10 m/s. The embryo-band nucleation, growth, and outcrop onto the opposite lateral surface is accompanied by generation of a broadband AE signal in the frequency range of similar to 10(2)-10(6) Hz. The low-frequency component of the AE signal in the range of similar to 0.1-1 kHz is related to the macroscopic band behavior, and the high-frequency component in the range of similar to 0.1-1 MHz contains data on the mesoscopic events, related to jumps in the velocity of embryo-band tip and its outcrop onto the external sample surface. The mechanisms of AE signal generation have been discussed.
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