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Visualization of the Skin-Effect under Electric Pulsing and Its Influence on Structure and Strength of Cryorolled Aluminum Alloy
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DOI：10.1134/S1067821225601388.png)
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Abstract
En 中文
Using a high-speed thermal imaging camera, the temperature field on the surface of a 3 & times; 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.
Keywords:
electropulsing
aluminum alloy
skin-effect
microhardness
microstructure
recrystallization
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0.9
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37
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