Electroplastic effect on AA1050 aluminium alloy formability

Ghiotti, Andrea; Bruschi, Stefania; Simonetto, Enrico; Gennari, Claudio; Calliari, Irene; Bariani, Paolo Francesco

doi:10.1016/j.cirp.2018.04.054

Cited by 41 publications

(10 citation statements)

References 14 publications

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“…This threshold value for the aluminum alloys was set around 200 A/mm 2 , but this was found in the case of pulsed electric current, whereas in the case of direct current application no studies are available reporting any threshold value. However, in [ 13 ] it was shown that material ductility could be improved by applying DC current for values of current density lower than the above-mentioned ones. Nevertheless, after the precipitation hardening process, the materials seem insensitive to the application of electricity during their plastic deformation from the viewpoint of an increase in their ductility.…”

Section: Discussionmentioning

confidence: 99%

“…Ross et al [ 11 ] reported that the flow stress could be significantly reduced by applying direct current during deformation; the formability of the tested specimens was, however, quite low due to its very high temperature and its heterogeneous distribution and hence the heterogeneous deformation of the specimens. However, Breda et al [ 12 , 13 ], through conducting tensile tests with direct current on the AA1050 pure aluminum, proved that the strain at fracture could be increased. Ruszkiewicz et al [ 14 , 15 ] studied the influence of direct and pulsed current on the mechanical properties of the AA7075-T6 aluminum alloy.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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/mm2 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.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…The discovery of such phenomenon led to the development of new approaches to material forming known as electrically assisted manufacturing (EAM) in which electrical current increases the formability of various metallic alloy exploiting the electroplastic effect (EPE). The electroplastic effect has shown to improve the formability on a wide variety of metallic materials such as aluminum [15][16][17], titanium [18][19][20], magnesium [21][22][23], stainless steels [24,25] and on a variety of forming processes as well. Some of the authors observed a relationship of the onset of EPE on FCC materials with respect the stacking fault energy (SFE), which drives dislocation's motion within the material [26].…”

Section: Introductionmentioning

confidence: 99%

Influence of Electropulsing Treatments on Mechanical Properties of UNS S32750 Duplex Stainless Steel

et al. 2020

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Prestrained at 5% and 15% duplex stainless steel UNS S32750 specimens have been subjected to electropulsing treatments with current density of 100 A/mm2 and 200 A/mm2 and 100 and 500 pulses for each current density value. Corrosion tests, X-ray diffraction, microhardness and residual stresses were collected before and after the electropulsing treatments. Tensile tests were performed after the electropulsing treatments in order to compare the mechanical response to reference tensile tests performed before pulsing treatments. Increase in fracture strain was observed after pulsing treatment in comparison to the reference tensile tests. A decrease in microhardness was also observed after electropulsing treatments for both degrees of prestrain. Electropulsing treatment almost eliminates the work-hardened state in the 5% prestrained specimens while partially recovered the 15% prestrained material increasing both uniform and fracture strain. Bulk temperature of the samples remained the same for all treatments duration. The effect are to be addressed to a combined effect of increase in atomic flux due to the electrical current and local joule heating in correspondence of crystal defects. Electropulsing treatment applied to metallic alloys is a promising technique to reduce the work hardening state without the need of annealing treatments in a dedicated furnace.

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“…The discovery of such phenomenon led to the development of new approaches to material forming known as electrically assisted manufacturing (EAM) in which electrical current increases the formability of various metallic alloy exploiting the Electroplastic effect (EPE). Electroplastic effect has shown to improve the formability on a wide variety of metallic materials such as aluminum [15][16][17], titanium [18][19][20], magnesium [21][22][23], stainless steels [24,25] and on a variety of forming process as well. Some of the authors observed a relation of the onset of EPE on FCC materials depending on the SFE, which drives dislocation's motion within the material [26].…”

Section: Introductionmentioning

confidence: 99%

Influence of Electropulsing Treatments on Mechanical Properties of UNS S32750 Duplex Stainless Steel

Gennari¹,

Pezzato²,

Tarabotti³

et al. 2020

Preprint

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Prestrained at 5% and 15% duplex stainless steel UNS S32750 specimens have been subjected to electropulsing treatments with current density of 100 A/mm2 and 200 A/mm2 and 100 and 500 pulses for each current density value. Corrosion tests, X-ray diffraction, microhardness and residual stresses were collected before and after the electropulsing treatments. Tensile tests were performed after the electropulsing treatments in order to compare the mechanical response to the reference tensile tests performed before the pulsing treatments. Increase in fracture strain was observed after the pulsing treatment in comparison to the reference tensile tests. A decrease in microhardness was also observed after the electropulsing treatments for both degrees of prestrain. Electropulsing treatment almost eliminates the work-hardened state in the 5% prestrained specimens while partially recovered the 15% prestrained material increasing both uniform and fracture strain. The bulk temperature of the samples remained the same for all the duration of the treatments. The effect are to be addressed to a combined effect of the increase in atomic flux due to the electrical current and local joule heating in correspondence of crystal defects. Electropulsing treatment applied to metallic alloys is a promising technique to reduce the work hardening state without the need of annealing treatments in a dedicated furnace.

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Electroplastic effect on AA1050 aluminium alloy formability

Cited by 41 publications

References 14 publications

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

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

Influence of Electropulsing Treatments on Mechanical Properties of UNS S32750 Duplex Stainless Steel

Influence of Electropulsing Treatments on Mechanical Properties of UNS S32750 Duplex Stainless Steel

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