Revealing a structural transition in typical Fe-based glass-forming alloy melts

Dong, Bangshao; Zhou, Shaoxiong; Wang, Y.G.; Li, Y.; Qin, Jingyu; Li, G.Z.

doi:10.1016/j.jnoncrysol.2018.04.049

Cited by 4 publications

(3 citation statements)

References 24 publications

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“…A non-uniform distribution of atoms takes place in the melt [21]. The tendency for different atoms to approach each other leads to the formation of clusters with a structure close to Fe 3 B and Fe 2 B [22,23], as well as Fe 3 Si and FeSi [24,25], and boron-based clusters are formed more easily [26]. The inhomogeneous structure of metal melts manifests itself in the features of the temperature dependences of physical properties.…”

Section: Multicomponent Meltsmentioning

confidence: 99%

Nanocrystalline Soft Magnetic Iron-Based Materials from Liquid State to Ready Product

Цепелев

Starodubtsev

2021

Nanomaterials

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The review is devoted to the analysis of physical processes occurring at different stages of production and application of nanocrystalline soft magnetic materials based on Fe–Si–B doped with various chemical elements. The temperature dependences of the kinematic viscosity showed that above a critical temperature, the viscosity of multicomponent melts at the cooling stage does not coincide with the viscosity at the heating stage. Above the critical temperature, the structure of the melt is more homogeneous, the amorphous precursor from such a melt has greater plasticity and enthalpy of crystallization and, after nanocrystallization, the material has a higher permeability. The most effective inhibitor elements are insoluble in α-Fe and form a smoothed peak of heat release during crystallization. On the other hand, the finest nanograins and the highest permeability are achieved at a narrow high-temperature peak of heat release. The cluster magnetic structure of a nanocrystalline material is the cause of magnetic inhomogeneity, which affects the shape of the magnetic hysteresis loop and core losses.

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Section: Multicomponent Meltsmentioning

confidence: 99%

Nanocrystalline Soft Magnetic Iron-Based Materials from Liquid State to Ready Product

Цепелев

Starodubtsev

2021

Nanomaterials

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“…The critical temperature is revealed on the temperature dependence of the melt viscosity, which is very sensitive to structural changes [ 7 , 8 , 9 ]. The Arrhenius equation determines the rate of the process, in particular, the rate of diffusion [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Kinematic Viscosity ofMulticomponent FeCuNbSiB-BasedMelts

2021

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The work investigated the temperature dependences of the kinematic viscosity for multicomponent melts of nanocrystalline soft magnetic alloys. It is shown that there is a linear relationship between the reduced activation energy of viscous flow Ea·(RT)−1 and the pre-exponential factor ν0. This ratio is universal for all quantities, the temperature dependence of which is expressed by the Arrhenius equation. It is shown that the activation energy of a viscous flow is linearly related to the cluster size on a natural logarithmic scale, and the melt viscosity increases with decreasing cluster size. The change in the Arrhenius plot in the anomalous zone on the temperature dependence of viscosity can be interpreted as a liquid–liquid structure transition, which begins with the disintegration of clusters and ends with the formation of a new cluster structure.

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“…Therefore, we can assume that the melt structure remains sufficiently stable if the activation energy does not change. The change in the activation energy on the temperature dependence of the viscosity is associated with a change in melt structure, and this phenomena is interpreted as a liquid-liquid structure transition (LLST) [3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Nickel on the Viscosity of Iron-Based Multicomponent Melts

Цепелев

Starodubtsev

Konashkov

2021

Metals

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In this work, we investigated the temperature dependence of the kinematic viscosity of multicomponent Fe72.5−xNixCu1Nb2Mo1.5Si14B9 melts with a Ni content of up to 12.7 at. %. The peculiarities of the temperature dependence of Ni-containing melts were explained by the tendency of Ni atoms to surface segregation. Ni atoms are concentrated near the interfaces of the liquid and solid phases in the mushy zone at the stage of melting and restrain the melting of the solid phase. With increasing Ni content, the Arrhenius type of viscous flow begins at a higher temperature. Ni atoms are concentrated at the periphery of clusters, increasing their size and decreasing their mobility. The movement of Ni-containing clusters increases the activation energy and decreases the kinematic viscosity. The change in the activation energy at a temperature of about 1700 K was associated with a liquid-liquid structure transition (LLST). This structural transition is reversible since it is observed both at the heating and cooling stages. The increase in kinematic viscosity at temperatures above 1900 K was associated with the decomposition of high-temperature clusters based on cementite and silicon oxides.

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Revealing a structural transition in typical Fe-based glass-forming alloy melts

Cited by 4 publications

References 24 publications

Nanocrystalline Soft Magnetic Iron-Based Materials from Liquid State to Ready Product

Nanocrystalline Soft Magnetic Iron-Based Materials from Liquid State to Ready Product

Kinematic Viscosity ofMulticomponent FeCuNbSiB-BasedMelts

The Effect of Nickel on the Viscosity of Iron-Based Multicomponent Melts

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