Effects of pulsed magnetic field on microstructures and morphology of the primary phase in semisolid A356 Al slurry

Zhang, L.; Li, W.; Yao, Jun; Qiu, Hao

doi:10.1016/j.matlet.2011.08.001

Cited by 32 publications

(13 citation statements)

References 14 publications

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“…Recently, the pulsed magnetic field (PMF) has been regarded as an effective method for grain refinement. The solidification microstructures of superalloy [1], steel [2], aluminum alloy [3,4], and magnesium alloy [5,6] can be significantly refined by the PMF. The PMF is easier to be controlled and higher in instantaneous energy than other magnetic fields, so it has been considered as a promising approach for grain refinement of metallic materials.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Influence of Pulsed Magnetic Field on the Superalloy Melt with the Solid–Liquid Interface in Directional Solidification

Zhang

Yang

2020

Acta Metall. Sin. (Engl. Lett.)

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The effect of the pulsed magnetic field on the grain refinement of superalloy K4169 has been studied in directional solidification. In the presence of the solid-liquid interface condition, the distributions of the electromagnetic force, flow field, temperature field, and Joule heat in front of the solid-liquid interface in directional solidification with the pulsed magnetic field are simulated. The calculation results show that the largest electromagnetic force in the melt appears near the solidliquid interface, and the electromagnetic force is distributed in a gradient. There are intensive electromagnetic vibrations in front of the solid-liquid interface. The forced melt convection is mainly concentrated in front of the solid-liquid interface, accompanied by a larger flow velocity. The simulation results indicate that the grain refinement is attributed to that the electromagnetic vibration and forced convection increase the nucleation rate and the probability of dendrite fragments survival, for making dendrite easily fragmented, homogenizing the melt temperature, and increasing the undercooling in front of the solid-liquid interface.

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Section: Introductionmentioning

confidence: 99%

Simulation of the Influence of Pulsed Magnetic Field on the Superalloy Melt with the Solid–Liquid Interface in Directional Solidification

Zhang

Yang

2020

Acta Metall. Sin. (Engl. Lett.)

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“…на расплавы и твердые металлы достигается значительное измельчение структуры без изменения химического состава [14][15][16]. В ходе многочисленных исследований было показано, что импульсные электромагнитные поля при воздействии на расплавленные металлы позволяют не только существенно измельчать первичные зерна, но и менять их морфологию за счет фрагментации дендритов [17][18][19][20].…”

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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“…Especially due to earlier studies by [91], it was confirmed that using PMF the grains in the metals can be changed from coarse dendrites to fine equiaxed. Some authors [101] employed a novel high-efficiency technique to process A356Al alloy during isothermal holding using PMF. The process achieved formation of rounder and finer alloy particles successfully.…”

Section: Effects Of Magnetic Treatmentmentioning

confidence: 99%

A review of magnetic-assisted machining processes

Peruri

Chaganti

2019

J Braz. Soc. Mech. Sci. Eng.

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There has been an increasing interest in the penetration of magnetic field-assisted machining processes in the industries. Due to the ease of contactless forces, magnetic fields have proved extremely versatile and relatively low cost when considering the potential increase in productivity of existing machining processes that it can provide. In this overview, we review the recent achievements and developments in magnetic field-assisted machining processes and their applications. A wide variety of machining domains are examined including electro-discharge machining (EDM), micro-EDM, electrochemical machining, magnetic-assisted machining and many more. The advantages and limitations of each implementation and potential future research pathways are also discussed.

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Effects of pulsed magnetic field on microstructures and morphology of the primary phase in semisolid A356 Al slurry

Cited by 32 publications

References 14 publications

Simulation of the Influence of Pulsed Magnetic Field on the Superalloy Melt with the Solid–Liquid Interface in Directional Solidification

Simulation of the Influence of Pulsed Magnetic Field on the Superalloy Melt with the Solid–Liquid Interface in Directional Solidification

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

A review of magnetic-assisted machining processes

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