Open AccessЭлектрохимическая эмиссия при деформировании и разрушении алюминий-магниевого сплава в водной среде
Author(s) -
А.А. Шибков,
М.Ф. Гасанов,
А.Е. Золотов,
М.А. Желтов,
А.А. Денисов,
Р.Ю. Кольцов,
С.С. Кочегаров
Publication year - 2020
Publication title -
žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-748X
pISSN - 0044-4642
DOI - 10.21883/jtf.2020.01.48666.151-19
Subject(s) - necking , materials science , deformation bands , deformation (meteorology) , nucleation , alloy , electrochemistry , acoustic emission , composite material , electrode , microstructure , chemistry , physics , thermodynamics
Spatio-temporal structures of Portevin-Le Chatelier deformation bands at the pre-failure stage, necking and destruction of an aluminum-magnesium alloy, deformable in an aqueous medium, were investigated by a complex of in situ methods, including high-speed video of the surface and an electrochemical emission method. The latter is based on measuring and analyzing jumps in the electrode potential of a deformable metal under the conditions of the manifestation of intermittent deformation. It is established that discrete signals of electrochemical emission in the frequency band of 10 Hz - 10 kHz contain information on the number of deformation bands, the moments of nucleation and stages of their growth, the statistical temporal structure of the bands, etc. A characteristic series of signals at the pre-failure stage is revealed − an electrochemical precursor neck formation and specimen fracture. The connection between the generation of electrochemical emission signals and the localization of plastic deformation and the destruction of an oxide film on an aluminum alloy surface in contact with an aqueous medium is discussed.