Electroplastic effect in AZ31B magnesium alloy sheet through uniaxial tensile tests

Xie, Huanyang; Wang, Qian; Peng, Fang-Le; Li, Kai; Dong, Xianghuai; Wang, Jianfeng

doi:10.1016/s1003-6326(15)63892-4

Cited by 30 publications

(13 citation statements)

References 18 publications

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“…The influence of the athermal effect on these factors was too small to induce recrystallization behaviour alone [ 69 ]. By comparing the true stress-true strain curves of AZ31B alloy under uniaxial tensile tests, the athermal effect under electropulses was confirmed [ 133 , 134 , 135 ].…”

Section: Theoretical Discussion On the Eptmentioning

confidence: 99%

Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

et al. 2018

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The technology of high-density electropulsing has been applied to increase the performance of metallic materials since the 1990s and has shown significant advantages over traditional heat treatment in many aspects. However, the microstructure changes in electropulsing treatment (EPT) metals and alloys have not been fully explored, and the effects vary significantly on different material. When high-density electrical pulses are applied to metals and alloys, the input of electric energy and thermal energy generally leads to structural rearrangements, such as dynamic recrystallization, dislocation movements and grain refinement. The enhanced mechanical properties of the metals and alloys after high-density electropulsing treatment are reflected by the significant improvement of elongation. As a result, this technology holds great promise in improving the deformation limit and repairing cracks and defects in the plastic processing of metals. This review summarizes the effect of high-density electropulsing treatment on microstructural properties and, thus, the enhancement in mechanical strength, hardness and corrosion performance of metallic materials. It is noteworthy that the change of some properties can be related to the structure state before EPT (quenched, annealed, deformed or others). The mechanisms for the microstructural evolution, grain refinement and formation of oriented microstructures of different metals and alloys are presented. Future research trends of high-density electrical pulse technology for specific metals and alloys are highlighted.

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Section: Theoretical Discussion On the Eptmentioning

confidence: 99%

Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

et al. 2018

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“…Particularly interesting and practically important for the development of new processing technologies is the mechanical behavior of metallic materials, for example, during tension accompanied by a pulsed current. It has been called the electroplastic effect (EPE) and has been studied in detail in many pure metals (Zn, Cd, Pb, Sn, Ti, Cu) and thermally stable alloys based on titanium (Ti64), magnesium (AZ31), aluminum (AA6000 and AA7000), copper (brass), and iron (austenitic steels) [1][2][3][4][5][6][7][8]. It was found that single current pulses (duty cycle q >>10) led to the appearance of downward stress jumps on the tensile curve.…”

Section: Introductionmentioning

confidence: 99%

Atypical behavior of materials during current-assisted tension

Stolyarov

2022

Lett. Mater.

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The passage of electric current in conductive materials is accompanied by a variety of physical phenomena, one of which is the so-called electroplastic effect, which manifests itself in a decrease in flow stresses and an increase in plasticity. Despite the early discovery of the electroplastic effect, the proposed mechanisms could not fully explain the observed experimental facts. Moreover, as shown in this study, some modes / regimes of electric current can lead to atypical strengthening phenomena even in pure metals and to atypical upward stress jumps in alloys with phase transformations. The paper considers examples of strengthening under a pulsed current with a density greater than the critical one and a duty cycle of more than 10 3 in pure metals, shape memory alloys, ferrite-pearlitic and stainless steels. It is assumed the selected current regimes provide the minimum thermal effect and maximum stress relaxation. The literature data and the results obtained, suggests that among the possible causes of strengthening there may be structural changes (recrystallization and refinement of grains, transformation of lamellar phases into spherical ones), martensitic transformation. It is concluded the atypical current effect is due to the material nature and high duty cycle of the electric current.

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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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Electroplastic effect in AZ31B magnesium alloy sheet through uniaxial tensile tests

Cited by 30 publications

References 18 publications

Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

Atypical behavior of materials during current-assisted tension

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

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