Electrically Assisted Forming

Salandro, Wesley A.; Jones, Joshua J.; Bunget, Cristina; Mears, Laine; Roth, Joseph

doi:10.1007/978-3-319-08879-2

Cited by 40 publications

(35 citation statements)

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“…Electrons travelling through the material allow an easier motion of dislocations in the same direction. An additional effect occurs when the travelling electrons help to separate and re-form metallic bonds, which increases the materials ductility and makes it more workable [19].…”

Section: Electroplastic Effectmentioning

confidence: 99%

“…The literature also provides a lot of different etchants for Mg-based alloys. The etchants listed in Table 2 [3,18,19] were used for deformed samples of the alloy AZ31, which among others was investigated in this work. This table shows that an important part of the selection process for optimal etching is the use of the same etchant with different concentrations of components.…”

Section: Sample Preparationmentioning

confidence: 99%

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Visualization and Observation of Morphological Peculiarities of Twin Formation in Mg-Based Samples After Electrically Assisted Forming

Reschka

Gerstein

Dalinger

et al. 2019

Metallogr. Microstruct. Anal.

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By using electrically assisted forming the usually rather poor workability of magnesium can be improved. The processes taking place during these forming operations have a strong influence on the microstructure. However, the metallographic preparation of magnesium is challenging due to its low hardness and strong tendency to oxidize. Therefore, a reliable preparation method was developed that revealed the microstructural features caused by the electrically assisted forming. The different morphologies of twins caused by plastic deformation and of those caused by an electric impulse could clearly be distinguished.

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Section: Electroplastic Effectmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

Visualization and Observation of Morphological Peculiarities of Twin Formation in Mg-Based Samples After Electrically Assisted Forming

Reschka

Gerstein

Dalinger

et al. 2019

Metallogr. Microstruct. Anal.

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“…In respect to metal processing, Molostkii and Fleurov [10] reported the following effects of high-density electric current pulses: Stress reduction during processing, fragility decrease, improvement of surface finishing, variation of values for tensile strength and strain, microstructure changes. The study of the aforementioned effects is known as Electrical Assisted Forming (EAF), one of the first published compilations was presented by Salandro et al [12]. EAF processing relies on the electroplastic effect, where thermal (in micro and macro scale) influences improve deformability of a metallic material [12].…”

Section: Introductionmentioning

confidence: 99%

“…The study of the aforementioned effects is known as Electrical Assisted Forming (EAF), one of the first published compilations was presented by Salandro et al [12]. EAF processing relies on the electroplastic effect, where thermal (in micro and macro scale) influences improve deformability of a metallic material [12]. At atomic level, Spitsyn y Troitskii [15] found that external current pulses generate changes on resistivity of metallographic defects such as boundary grain, dislocations and inclusions; promoting dislocation mobility and modification of mechanical behaviour of material.…”

Section: Introductionmentioning

confidence: 99%

Electropulsing effects on mechanical and metallurgical behavior of AISI-SAE 4140 steel

Montilla¹,

González²,

Higuera³

et al. 2018

ces

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The electroplasticity phenomenon (EP) produces changes in the mechanical properties of a metal, due to the simultaneous application of mechanical stresses of compression, bending, etc., and high instantaneous current pulses. The changes produced on the plastic deformation rate by the EP are due to thermal effects (such as Joule effect) and other effects associated to the electric and magnetic fields. There are only a few studies that consider, as this paper does, the effects of electropulsing effect on tensile test processes in which the electron flow is esteemed as the main reason. In this paper, the results of a research on tensile test on specimen of AISI-SAE 4140, assisted by high-current-density electric pulses are presented. The aim is to evaluate the effect of these pulses on the microstructure and mechanical properties of metallic materials. The phase transformations and microstructural changes in the metallic specimens exposed to EP were analysed using Scanning Electron Microscopy (SEM), Diffraction Ray X (DRX) and Differential Scanning Calorimetry (DSC). Preliminary results show there are some differences in the material behaviour, between the specimens tensile tested with and without EP, such as: decreases values of yield and ultimate strength and XRD analyses attests to a slight displacement and intensity reduction of diffraction. Moreover, the application of current density in the order of 2.18 A/mm² is enough to produce changes in mechanical and metallographic properties of AISI/SAE 4140.

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“…Electroplasticity (EP) is a phenomenon in which applied pulsed electric fields during deformation result in increased formability in metals. This phenomenon has been studied since the 1950's [1] and researchers have proposed two possible origins of this nearly-universal effect: (1) localized Joule heating at lattice defects and (2) the electron wind effect leading to vacancy migration [2]. However, there is no clear evidence of the true origin of this behavior at the level of individual defects [3].…”

mentioning

confidence: 99%