The Effect of Direct Electric Current on the Plastic Behavior of AA7075 Aluminum Alloy in Different States of Hardening

Electrically-Assisted Forming (EAF) techniques are interesting and promising for the automotive industry. Electrically-assisted tensile tests were carried out on specimens of AA7075 aluminum alloy in different states of hardening, namely T6 (the as-received state) and the supersaturated solid soluti...

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Bibliographic Details
Published in:Materials 2020-12, Vol.14 (1), p.73
Main Authors: Dobras, Daniel, Bruschi, Stefania, Simonetto, Enrico, Rutkowska-Gorczyca, Małgorzata, Ghiotti, Andrea
Format: Article
Language:English
Subjects:
Alloys
Aluminum alloys
Aluminum base alloys
Automobile industry
Cameras
Electric currents
Fractures
Hardening
Ohmic dissipation
Portevin-le Chatelier effect
Resistance heating
Serrated yielding
Solid solutions
Tensile tests
Tension tests
Transmission electron microscopy
Weight reduction
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Summary:Electrically-Assisted Forming (EAF) techniques are interesting and promising for the automotive industry. Electrically-assisted tensile tests were carried out on specimens of AA7075 aluminum alloy in different states of hardening, namely T6 (the as-received state) and the supersaturated solid solution state. All the tests were carried out in quasi-static conditions under the application of direct electric current (DC) in the range of 90 to 540 A. The experimental results showed that with a DC density of 10 A/mm the uniform strain and strain at fracture increased when the AA7075 was in the supersaturated solid solution state. A correlation between the mechanical results and microstructural features analysed through transmission electron microscopy was assessed. An explanation of the investigated phenomena based on the electron wind theory, heterogeneous microscale Joule heating and the Portevin-Le Chatelier (PLC) effect was finally proposed.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14010073