Effect of pulsed current on structure of Al-Mg-Si aluminum-based alloy during cold deformation

Бродова, И. Г.; Ширинкина, И. Г.; Астафьев, В. В.; Yablonskikh, T. I.; Potapova, A. A.; Stolyarov, V. V.

doi:10.1134/s0031918x13110021

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…The prob lem of enhancing the process ductility of aluminum alloys while retaining high strength characteristics is of great significance, since most of the aluminum based compositions are structurally heterogeneous and con tain eutectic phases, which cause an increased brittle ness in the course of the deformation of these alloys. In the previous experiments described in [7,8], the posi tive effect of EPDR at a current strength of 30 A/mm 2 on the process ductility of the AD33 aluminum-sili con alloy has been shown.…”

Section: Introductionmentioning

confidence: 93%

Structural and phase transformations in aluminum-copper alloys under the effect of electroplastic deformation

Ширинкина

Бродова

Астафьев

et al. 2014

Phys. Metals Metallogr.

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The deformational structure and the phase composition of binary and commercial aluminumcopper alloys produced using electroplastic deformation by rolling (EPDR) have been studied. It has been shown that structural transformation in the materials and changes in their hardness in the course of EPDR are governed by the initial state, which determines the distribution and the thermomechanical stability of a dislocation ensemble. It has been found that EPDR causes the dynamic deformation induced aging of the aluminum based supersaturated solid solution, which is accompanied by the precipitation of the strengthen ing θ phase in the Al-Cu alloy and the S phase in the D16 alloy.

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Section: Introductionmentioning

confidence: 93%

Structural and phase transformations in aluminum-copper alloys under the effect of electroplastic deformation

Ширинкина

Бродова

Астафьев

et al. 2014

Phys. Metals Metallogr.

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“…The method of electroplastic cold rolling has become the most widespread. It was applied to materials based on titanium [ 28 , 45 ], aluminum [ 94 , 95 , 96 ], magnesium [ 97 ], TiNi shape-memory alloys [ 67 , 98 ], and steels [ 99 ]. The benefit of combining external influences was observed in an increase in deformability, reduction of force, and improvement of productivity (by reducing the number of technological operations).…”

Section: Application Of Epementioning

confidence: 99%

A Pulsed Current Application to the Deformation Processing of Materials

Stolyarov,

Misochenko

2023

Materials

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A review of studies on the electroplastic effect on the deformation process in various conductive materials and alloys for the last decade has been carried out. Aspects, such as the mode and regimes of electric current, the practical methods of its introduction into materials with different deformation schemes, features of deformation behavior accompanied by a pulsed current of different materials, structural changes caused by the combined action of deformation and current, the influence of structural features on the electroplastic effect, changes in the physical, mechanical, and technological properties of materials subjected to plastic deformation under current, possible mechanisms and methods of physical and computer modeling of the electroplastic effect, and potential and practical applications of the electroplastic effect are considered. The growing research interest in the manifestation of the electroplastic effect in such new modern materials as shape-memory alloys and ultrafine-grained and nanostructured alloys is shown. Various methods of modeling the mechanisms of electroplasticity, especially at the microlevel, are becoming the most realistic approach for the prediction of the deformation behavior and physical and mechanical properties of various materials. Original examples of the practical application of electropulse methods in the processes of drawing, microstamping, and others are given.

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“…Деформационная способность материалов является одной из механических характеристик, которая определяет способность твердых тел изменять форму и размеры под воздействием внешних факторов, включая обработку давлением. Эта характеристика важна для оценки [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Среди исследованных материалов особая роль принадлежит сплавам на основе упорядоченного интерметаллического соединения TiNi, обладающего эффектом памяти формы (ЭПФ) и сверхупругостью при температурах, близких к комнатной [16,17].…”

Section: Introductionunclassified

Deformability of TiNiHf shape memory alloy under rolling with pulsed current

Stolyarov¹,

Андреев²,

Karelin³

et al. 2022

Metal Working and Material Science

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Introduction. The deformation capacity of materials is one of the main mechanical characteristics that determine the possibility of its production using various technological processes for metal forming. Among intermetallic compounds, a special role belongs to alloys with a high-temperature shape memory effect (SME) based on TiNi with the addition hafnium. Most of these alloys are not only difficult to deform, but also quite brittle. Therefore, the development of any technological schemes to increase the deformation capacity of these alloys is relevant. The purpose of the work: to study the deformation capacity and the possibility of using electric pulsed current during cold rolling of the TiNiHf alloy. This processing method has not previously been applied to these alloys. In this work, the deformation capacity during cold rolling of a strip 2 mm thick made of a hard-to-deform high-temperature TiNi-based shape memory alloy with the addition of hafnium is studied. To increase the deformability, an external action in the form of a high-density pulsed current of more than 200 A/mm2 is investigated. The research methods are: X-ray analysis to assess the initial phase state; analysis of the evolution of true and engineering deformation to failure (appearance of visible macrocracks in the deformation zone); optical microscopy with magnification from 50 to 100 and measurement of Vickers hardness at room temperature. Results and discussion. An increase in the deformability under the influence of a pulsed current compared to rolling without current and the achievement of a maximum strain of 1.7 (true) and 85% (engineering) are established. The initial coarse-grained equiaxed martensitic microstructure (50 μm) is transformed into a microstructure elongated along the rolling direction, while the hardness increases by 50%. The absence of noticeable structural changes and the observed hardening may indicate a nonthermal effect of the current in increasing the deformability. Thus, the results of the conducted studies indicate the prospects of the method of rolling with a current of a hard-to-deform TiNiHf shape memory alloy as a method of metal forming.

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Effect of pulsed current on structure of Al-Mg-Si aluminum-based alloy during cold deformation

Cited by 4 publications

References 7 publications

Structural and phase transformations in aluminum-copper alloys under the effect of electroplastic deformation

Structural and phase transformations in aluminum-copper alloys under the effect of electroplastic deformation

A Pulsed Current Application to the Deformation Processing of Materials

Deformability of TiNiHf shape memory alloy under rolling with pulsed current

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