Grain-boundary diffusion modeling in a microstructural material

Chepak-Gizbrekht, M.V.; Knyazeva, A. G.

doi:10.1016/j.commatsci.2020.109896

Cited by 13 publications

(5 citation statements)

References 46 publications

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“…For polycrystalline materials, the concentration distribution of a constant diffusion source is always given by the error function form for fitting a semi-infinite diffusion profile [34],…”

Section: Resultsmentioning

confidence: 99%

Grain boundary diffusion mechanism in Dy-diffused Nd–Fe–B sintered magnets

Dai,

Li,

Wang

et al. 2024

J. Phys. D: Appl. Phys.

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The grain boundary diffusion (GBD) is an effective method to enhance the thermal stability of the Nd-Fe-B based permanent magnets. For developing a high-performance magnet, it is critical to carry out a study on its mechanism, in order to reveal the distribution regulations of diffusion solutes and microstructural evolution. In the present work, the phase-field method is applied to investigate the thermodynamic feature and the heavy rare-earth Dy migration in a Dy-diffused Nd-Fe-B magnet during the GBD process. In the simulation process, the grain phase transformation and volume diffusion were taken into consideration and the effects of the diffusion mode, initial diffusion source concentration, grain size, and grain boundary width were explored in a set of magnet models with various grain sizes. An optimized fitting function was introduced to evaluate the solute distribution in grain boundaries and the effective diffusion coefficient. It is proven that the diffusion mode and the grain boundary width have significant impacts on the effective diffusion coefficient. The results provide a theoretical scheme concerning the quantitative evaluation of GBD efficiency based on the thermodynamic analysis.

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“…For polycrystalline materials, the concentration distribution of a constant diffusion source is always given by the error function form for fitting a semi-infinite diffusion profile [34],…”

Section: Resultsmentioning

confidence: 99%

Grain boundary diffusion mechanism in Dy-diffused Nd–Fe–B sintered magnets

Dai,

Li,

Wang

et al. 2024

J. Phys. D: Appl. Phys.

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“…In fact, during the oxidation process, the mass transfer includes gas to gas, gas through oxide to steel, and material transportation within the steel. The oxidizing agent H 2 O prefers to diffuse along the grain boundaries into the steel substrate [19,25,26] and reacts with active elements to generate consequential oxides. H 2 O is consumed while H 2 is produced, resulting in a concentration difference in H 2 O and H 2 between the interfaces of gas/oxide and oxide/steel, and thus H 2 O diffuses inward while H 2 diffuses outward.…”

Section: Normalization Of Oxidation Processmentioning

confidence: 99%

Influence of Furnace Pressure on the Growth Characteristic of Oxide Film on Piercing Plug Steel

Lu,

Tian

2024

steel research int.

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Different oxidation processes are carried out by using 20Cr2Ni4 piercing plug steel to study the influence of furnace pressure on the growth characteristic of oxide film in high‐temperature C2H5OH–H2O atmosphere. The results show that oxide film under different processes shows clearly two layers. The inner film is porous with the main constituents of FeO and Fe3O4 while the outer film is dense with large bubbles. The elemental Ni aggregates as a dot‐like substance in the inner oxide, where the enrichment of Cr lags behind the frontier boundary of Ni distribution. It is found that the thickness of the oxide film shows a parabolic relationship with product of the square root of oxidation time and furnace pressure. High furnace pressure can keep the pressure balance of the bubbles to swell to sufficient size, but may cause cracking during the relief process of pressure.

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“…Химические реакции описываются суммарной кинетикой вида A + B → P, где A -исходный материал, B -диффузант, P -продукт. Постановка задачи отличается от [4] выделением индивидуальной границы зерна и приближением постоянной температуры, а от [5] учетом времен релаксации диффузии.…”

Section: институт физики прочности и материаловедения со ран томскunclassified

Особенности Зернограничной Диффузии, Сопровождаемой Образованием Новой Фазы, При Импульсной Модификации Поверхности Потоком Частиц

2021

Международная Конференция "Физическая Мезомеханика. Материалы С Многоуровневой Иерархически Организованной Структурой И Интелле

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Grain-boundary diffusion modeling in a microstructural material

Cited by 13 publications

References 46 publications

Grain boundary diffusion mechanism in Dy-diffused Nd–Fe–B sintered magnets

Grain boundary diffusion mechanism in Dy-diffused Nd–Fe–B sintered magnets

Influence of Furnace Pressure on the Growth Characteristic of Oxide Film on Piercing Plug Steel

Особенности Зернограничной Диффузии, Сопровождаемой Образованием Новой Фазы, При Импульсной Модификации Поверхности Потоком Частиц

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