Theoretical basis for electro- and magnetoplasticity

Molotskii, M.

doi:10.1016/s0921-5093(00)00782-6

Cited by 132 publications

(75 citation statements)

References 35 publications

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“…The theories not only cannot be expressed one through other, but they also do not exclude one another. So, for example, thermal expansion at big rate, that is told of by Bilyk et al and Unger et al [34,35], does not prohibit the magnetic field influence upon the spins of dopants and pinned dislocation cores, that are involved in Molotskii's model [32][33][34]. Other mechanisms are also not discarded.…”

Section: Resultsmentioning

confidence: 99%

“…For checking Molotskii's et al model [32][33][34], it is necessary to carry out tests on the materials without paramagnetic dopants. 7.…”

Section: Resultsmentioning

confidence: 99%

“…The second subsection deals with the Michel Molotskii's theory, which is presented in his articles [32][33][34]. In his earlier works, Molotskii considered the influence of magnetic field on the interaction of dislocations with paramagnetic dopants-stoppers.…”

Section: Comparison Of Different Theoretical Models With Experimentalmentioning

confidence: 99%

“…Michel Molotskii in his works [32][33][34] proposes the following model of the influence of magnetic field upon the plastic properties of the material. Electroplastic effect, according to Molotskii, is a particular manifestation of magnetoplastic effect, when the magnetic field is created by the electric current.…”

Section: Influence Of the Electric Current Density On The Plasticizatmentioning

confidence: 99%

“…In the work [34], the inverse relationship between dislocation mean free path and dopant concentration is suggested.…”

mentioning

confidence: 99%

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Influence of Alternating Magnetic Field on Physical and Mechanical Properties of Crystals

Karas

Karasyova

Mats

et al. 2016

Metallofiz. Noveishie Tekhnol.

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The results of the investigation of creep characteristics and activation parameters of polycrystalline nickel (of 99.996% purity) plastic flow at the temperature of 77 K are presented. The influence of nonstationary magnetic field with strength of 500 Oe (harmonic (50 Hz) and monopolar pulses of the same frequency) on the nickel creep characteristics is studied. We have deliberately conducted experimental investigations of the influence of nonstationary magnetic field of alternating and constant sign at constant temperature in order to estimate the contribution to the dislocations' mobility from the interaction of dislocations with the mobile domain boundaries as well as from the heat effects connected with the induction electric field. The proposed model of electroplastic effect (EPE) suggests the following mechanism of weakening under the action of electric field. Electric field gives energy to conductivity electron subsystem, making it thermodynamically nonequilibrium. Nonequilibrium electrons while interacting with acoustic phonons transfer more energy to short-wave part of the phonon spectrum. Short-wave phonons due to large stress gradient effectively detach dislocations from stoppers. Experimental results qualitatively match with the data obtained after numerical calculations.Key words: magnetoplastic effect, alternating magnetic field, dislocation mobility, creep rate, ferromagnetic crystal, nonequilibrium electron and phonon subsystem.Наведено результати досліджень характеристик плазучости та актива-ційних параметрів пластичної течії полікристалічного ніклю (99,996% чистоти) за постійної температури у 77 К. Досліджувався вплив нестаціо-нарного магнетного поля напруженістю у 500 Е (гармонічні (50 Гц) та од-нополярні імпульси тієї ж частоти) на параметри плазучости ніклю. Екс-периментальні дослідження з впливу нестаціонарного магнетного поля змінного та сталого знаку за постійної температури проводилися, щоб оцінити внесок у рухливість дислокацій від взаємодії дислокацій з рух-ливими межами домен, а також від теплових ефектів, пов'язаних з індук-ційним електричним полем. Пропонований модель електропластичного ефекту (ЕПЕ) передбачає наступний механізм знеміцнення під дією елек-тричного поля. Електричне поле передає енергію підсистемі електронів провідности, роблячи її термодинамічно нерівноважною. Нерівноважні електрони, що взаємодіють з акустичними фононами, передають енергію переважно короткохвильовій частині фононного спектру. Короткохви-льові фонони, завдяки великому ґрадієнту напруги, ефективно відкріп-люють дислокації від стопорів. Результати експериментів якісно збіга-ються з даними числових розрахунків.Ключові слова: магнетопластичний ефект, змінне магнетне поле, рухли-вість дислокацій, швидкість плазучости, феромагнетний кристал, нерів-новажна електронна та фононна підсистеми.Представлены результаты исследования характеристик ползучести и ак-тивационных параметров пластического течения поликристаллического никеля (99,996% чистоты) при температуре 77 К. Было изучено влияние нестационарного магнитн...

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Section: Resultsmentioning

confidence: 99%

“…For checking Molotskii's et al model [32][33][34], it is necessary to carry out tests on the materials without paramagnetic dopants. 7.…”

Section: Resultsmentioning

confidence: 99%

Section: Comparison Of Different Theoretical Models With Experimentalmentioning

confidence: 99%

Section: Influence Of the Electric Current Density On The Plasticizatmentioning

confidence: 99%

“…In the work [34], the inverse relationship between dislocation mean free path and dopant concentration is suggested.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Influence of Alternating Magnetic Field on Physical and Mechanical Properties of Crystals

Karas

Karasyova

Mats

et al. 2016

Metallofiz. Noveishie Tekhnol.

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Effect of high‐density current electropulsing on corrosion cracking of titanium aluminide intermetallic

Babutskyi

Chrysanthou

Chyzhyk

et al. 2021

Materials & Corrosion

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The effect of electropulsing on the corrosion cracking of titanium aluminide produced by self-propagating high-temperature synthesis has been investigated. The electropulsing treatment led to improved corrosion resistance in sodium fluoride solution and also eliminated corrosion cracking at the α 2 /γ interface during corrosion in a solution of nitric and hydrofluoric acids. This behavior was attributed to thermal and athermal effects resulting from electropulsing and leading to the interaction of conduction electrons with the defect structure. The effect of magnetic field accompanying electropusling on depinning of dislocations also has been discussed. Support for this is provided on the basis of X-ray diffraction analysis and microhardness testing.

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A review of electrically assisted heat treatment and forming of aluminum alloy sheet

Dong

et al. 2022

Int J Adv Manuf Technol

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Theoretical basis for electro- and magnetoplasticity

Cited by 132 publications

References 35 publications

Influence of Alternating Magnetic Field on Physical and Mechanical Properties of Crystals

Influence of Alternating Magnetic Field on Physical and Mechanical Properties of Crystals

Effect of high‐density current electropulsing on corrosion cracking of titanium aluminide intermetallic

A review of electrically assisted heat treatment and forming of aluminum alloy sheet

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