Using a high-speed thermal imaging camera, the temperature field on the surface of a 3 × 3 mm square sample of cryorolled high-strength aluminum alloy was recorded and analyzed during high-dense electropulsed processing. Uneven heating of the surface was observed, manifested by elevated temperatures in areas adjacent to the fins. The results of a comparative analysis of the alloy microstructure changes by SEM-EBSD method and the microhardness distributions along the specimen cross-section, induced by a current pulsing, are discussed. It was found that in zones of increased heating adjacent to the specimen’s surfaces, static processes of recovery and recrystallization of the highly work-hardened structure were more intense and accompanied by greater softening. It is concluded that this phenomenon is caused by the skin-effect inherent to electropulse treatment. Good agreement is demonstrated between the depth of the softened layer and the calculated current penetration depth into the conductor.
Valeeva et al. (Sun,) studied this question.
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