Influence of a Magnetic Field on Structure Formation during the Crystallization and Physicomechanical Properties of Aluminum Alloys

Вдовин, К. Н.; Dubsky, G A; Деев, В. Б.; Egorova, L. G.; Nefediev, A. A.; Прусов, Е. С.

doi:10.3103/s1067821219030155

Cited by 14 publications

(4 citation statements)

References 27 publications

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“…Однако детальные механизмы модифицирующего воздействия такой обработки на структуру алюминиевых сплавов остаются дискуссионными. Исследования многих специалистов, работающих в этих направлениях в последние десятилетия, направлены преимущественно на изучение влияния импульсных электромагнитных полей на размеры и морфоло-гию структурных составляющих в алюминиевых сплавах, а также на перераспределение легирующих элементов в процессах микро-и макросегрегации во взаимосвязи со свойствами и характеристиками получаемых литых заготовок [22][23][24][25].…”

Section: Modification Of Al-mg-si Casting Aluminum Alloys By Liquid P...unclassified

Modification of Al–Mg–Si casting aluminum alloys by liquid phase processing with nanosecond electromagnetic pulses

Деев¹,

Ri²,

Прусов³

et al. 2021

Izv.VUZ. Tsvet. Met.

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The AA 511 alloy of the Al–Mg–Si system was used as an example to demonstrate that aluminum melt irradiation with nanosecond electromagnetic pulses (NEPs) leads to a significant change in the nature of structure formation during crystallization. It was found that an increase in the frequency of melt irradiation with NEPs is accompanied by the refinement of the alloy structural components, while the greatest grain size reduction of the α-solid solution and intergranular inclusions of the eutectic Mg2Si phase is observed at a NEPs frequency f = 1000 Hz. An increase in the NEPs frequency leads to a significant increase in the concentration of magnesium in the α-solid solution and the fragmentation of Mg2Si phase intergranular inclusions, which is released in the form of compact isolated inclusions when the melt is irradiated at a frequency of 1000 Hz. It was shown that melt processing with NEPs leads to an increase in the Brinell hardness of as-cast specimens, as well as to a significant increase in the microhardness of α-solid solution grains (from 38.21 HV in the initial state to 61.85 HV after irradiation with a frequency of 1000 Hz). It was assumed that the effect of a pulsed electromagnetic field leads to a decrease in the critical values of the Gibbs free energy required to initiate nucleation processes, and to a decrease in the surface tension at the «growing crystal – molten metal» interface, which causes a modifying effect on the alloy structure due to a decrease in the critical size of crystal nuclei.

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Section: Modification Of Al-mg-si Casting Aluminum Alloys By Liquid P...unclassified

Modification of Al–Mg–Si casting aluminum alloys by liquid phase processing with nanosecond electromagnetic pulses

Деев¹,

Ri²,

Прусов³

et al. 2021

Izv.VUZ. Tsvet. Met.

Self Cite

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“…There are other equally effective but less studied methods of external energy deposition, such as magnetic fields. As an effective action parameter, the magnetic field is extremely useful for modification of the microstructure and optimization of the material properties [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. The application of the magnetic field in treating the surface of hypereutectic silumin results in a refinement of the primary silicon, which improves its hardness and microhardness [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Constant Magnetic Field upon Fatigue Life of Commercially Pure Titanium

et al. 2022

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Cyclic tests of the multicycle fatigue of commercially pure titanium were performed under normal conditions (without a magnetic field) and after exposure to a constant magnetic field of varying density (B = 0.3, 0.4, 0.5 T). It was shown that the application of the constant magnetic field of varying density led to a fold increase in the average number of cycles to destruction of the VT1-0 titanium samples by 64, 123, and 163%, respectively. Scanning electron microscopy revealed that the magnetic field led to a 1.45-fold increase in the critical length of the fracture (the width of the fatigue crack growth zone) and a 1.6-fold decrease in the distance between the fatigue striations in the accelerated crack growth zone of the destroyed titanium samples. It was established that a subgrain (fragmented) structure formed in the area of the fatigue growth of the fracture of the titanium samples. The size of the subgrains corresponded to the spaces between the fatigue striations, which had an inhibitory influence on the microcrack propagation. Collectively, the revealed facts are indicative of a higher material resistance to fatigue fracture propagation and increased operation resources under the fatigue tests in the magnetic field, which correlates with the data on the growth of the average number of cycles to fracture of the VT1-0 titanium samples.

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“…A number of methods are known to improve a surface state responsible for microcracking [ 12 , 13 , 14 , 15 , 16 ]. The impact of an electron beam on the surface represents one of the future techniques [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Fatigue-Induced Evolution of AISI 310S Steel Microstructure after Electron Beam Treatment

et al. 2020

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Research was carried out to explore the effect of pulsed electron beam irradiation on the behavior of structure and phase state in AISI 310S steel exposed to high-cycle fatigue. A 2.2 times increase in the fatigue life of samples irradiated by electron beams was revealed. The outcomes of scanning and transmission electron microscopic studies suggest the most probable reason for the fracture of steel samples irradiated by a high-intensity electron beam to be microcraters originating on a treated surface and acting as stress risers initiating the propagation of microcracks. The irradiation with a pulsed electron beam causes extremely fast melting of the surface. As a result of the subsequent rapid crystallization, a polycrystalline structure nearly twice as small as an average grain in the untreated steel is formed. Since a surface layer crystallizes rapidly, crystallization cells ranging from 120 to 170 nm develop in the volume of grains. The fatigue testing is shown to be associated with a martensite transformation γ ⇒ ε in the surface layer. One option to intensify a fatigue life increase of the steel in focus is supposed to be the neutralization of crater-forming on a surface treated by electron beams.

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Influence of a Magnetic Field on Structure Formation during the Crystallization and Physicomechanical Properties of Aluminum Alloys

Cited by 14 publications

References 27 publications

Modification of Al–Mg–Si casting aluminum alloys by liquid phase processing with nanosecond electromagnetic pulses

Modification of Al–Mg–Si casting aluminum alloys by liquid phase processing with nanosecond electromagnetic pulses

Influence of Constant Magnetic Field upon Fatigue Life of Commercially Pure Titanium

Fatigue-Induced Evolution of AISI 310S Steel Microstructure after Electron Beam Treatment

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