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Electrochemical response to discontinuous deformation of Porteven-Le Chatelier


It has been experimentally established that the discontinuous deformation of a deformable sample of an aluminum-magnesium alloy immersed in an aqueous NaCl solution is accompanied by jumps in the electrochemical potential of the sample surface with an amplitude of up to ~ 10 mV. The potential jumps occur simultaneously within ~ 1 ms with jumps of mechanical stress and are associated, as expected, with the rupture of the oxide film caused by the exit to the sample surface of the localized plastic deformation band.


jerky flow; the Portevin-Le Chatelier effect; deformation band; electrochemical potential; dislocation charge

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