Melt Viscosity of the Soft Magnetic Nanocrystalline Fe72.5Cu1Nb2Mo1.5Si14B9Alloy

Цепелев, В. С.; Starodubtsev, Yu. N.; Konashkov, V. V.

doi:10.1051/epjconf/201715104006

Cited by 6 publications

(6 citation statements)

References 9 publications

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“…The heredity of the structure was investigated on samples of amorphous ribbon, which was obtained after heating the melt above and below the critical temperature. After high-temperature holding of melt, an amorphous ribbon has a lower ordering of atoms [41], a larger molar volume [42], greater plasticity [41,43], hardness and fracture toughness [43], and a higher enthalpy of crystallization [42,44]. Thus, the heredity of the melt structure remains in the amorphous solid state after melt quenching.…”

Section: Multicomponent Meltsmentioning

confidence: 99%

“…At the first stage of crystallization, nanocrystalline grains are formed with an average size of about 10 nm [50]. It is important that in an amorphous ribbon prepared from an overheated melt, there are noticeably more small grains 1-2 nm in size [44]. At the second stage of crystallization, metastable phases based on Fe-B and Fe-Si are formed [51], while Fe-B, Fe-Nb, and Nb-B clusters dominate in the melt [52].…”

Section: Multicomponent Meltsmentioning

confidence: 99%

“…An amorphous precursor obtained from a homogeneous melt has high plasticity and hardness, as well as the enthalpy of crystallization. After nanocrystallization of an amorphous precursor from a overheated melt, a magnetic material with a higher permeability was obtained [44].…”

Section: Temperature Rangementioning

confidence: 99%

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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%

Section: Multicomponent Meltsmentioning

confidence: 99%

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

Цепелев

Starodubtsev

2021

Nanomaterials

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“…Heating of melt above the critical temperature T k followed by quenching makes it possible to obtain an amorphous state with a more homogeneous structure. Such an amorphous material has a larger molar volume [4], enthalpy of crystallization [4,5] and plasticity [6]. This proves that the heredity of the melt structure is preserved in the amorphous solid state.…”

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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“…According to [4][5][6][7][8][9][10], with heating of liquid multicomponent alloy to certain temperatures Т*, irreversible occur -destruction of the microheterogeneity. The microheterogeneity is understood as microheterogeneous state of melt one containing dispersed particles enriched in one component, suspended in an environment of another composition and separated from it by a well-defined interface [5].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of the Alloy Mg61Cu28Gd11 in Submicrovolumes

Barashev

Чикова

Tkachuk

2020

MSF

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We studied the microstructure and nanomechanical properties of cast samples of the alloy Mg61Cu28Gd11, obtained by the original method. The alloy Mg61Cu28Cd11 is distinguished by a particularly high glass transition property. In this study samples with a diameter of 16 mm were obtained an inert atmosphere with a cooling rate of 1K/s. Liquid alloy Mg61Cu28Gd11 before crystallization was heated to 780 °C. It was previously installed that, with such heating, irreversible structural changes occur in the melt, which increase the tendency of the metal to glass transition. A metallographic study of the microstructure was performed using a scanning electron microscope and EDS-analysis. Nanohardness HV and Young's modulus E Mg2CuCd and Mg2Cu were measured using the nanoindentation method.The microstructure of the Mg61Cu28Cd11 alloy in the cast state consists mainly of Mg2Cu dendrites; the interdendritic space is represented by the Mg2CuCd phase. The presence of exogenous nonmetallic inclusions of a complex composition CdO + CuO + MgO was also established by the method of micro X-ray spectral analysis.Analysis of the measurement data of HV(GPa), E (GPa) gave a conclusion about the same degree of homogeneity of the mechanical properties of dendrites and interdendritic space.

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Melt Viscosity of the Soft Magnetic Nanocrystalline Fe_72.5Cu₁Nb₂Mo_1.5Si₁₄B₉Alloy

Cited by 6 publications

References 9 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

Microstructure and Mechanical Properties of the Alloy Mg61Cu28Gd11 in Submicrovolumes

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