Effects of Si/B ratio on the isothermal crystallization behavior of FeNiSiBCuNb amorphous alloys

Chen, Zhe; Zhu, Qianke; Li, Zhien; Guo, Qi; Zhang, Kewei; Jiang, Yong

doi:10.1016/j.tca.2020.178854

Cited by 10 publications

(6 citation statements)

References 32 publications

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“…Instead, an expression for the apparent activation energy representative of the entire crystallization process, E a app , can be derived by noting that the time t x required to reach a certain crystalline volume fraction, for example, t 0.05 , t 0.50 , and t 0.99 , frequently follows an Arrhenius-like relationship − where t 0 is a pre-exponential constant, R is the universal gas constant, and T is the temperature given in Kelvin. Hence, a plot of ln t x versus 1/ T typically gives a straight line whose slope relates to the apparent activation energy given at specific volume fractions.…”

Section: Methodsmentioning

confidence: 99%

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Circumventing Thermodynamic Constraints in Nucleation-Controlled Crystallization of Al₂TiO₅-Based Chemical Vapor Deposition Coatings

Öhman

Nagy

et al. 2022

Chem. Mater.

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Nucleation is a fundamental part in most syntheses of ceramic materials. Yet, few techniques enable control of this step, which would offer possibilities to attain full-scale kinetic selectivity of the syntheses to reach novel compounds with unique properties. Herein, we present a nucleationcontrolled crystallization pathway to synthesize coatings of aluminum titanate (Al 2 TiO 5 )renowned for its low-to-negative thermal expansionat significantly reduced temperatures than conventional solid-state techniques. Based on a kinetic study using in situ X-ray diffraction, detailed mechanistic insights into the crystallization process and phase evolutions within the Al− Ti−O system are obtained. The lowest activation energies for crystallization are given when the Al−Ti ratio is close-to-stoichiometric or Ti-enriched. Along with these compositions' similar kinetics at the earliest stages of the transformation, a joint nucleation behavior is discovered, revealing the elemental role of titanium in nucleating the main Al 2 TiO 5 phase. Based on classical nucleation theory, we deduce the significant influence of the configurational entropy (S config ) when crystallization occurs in the nucleation-controlled domain. Finally, peculiar transition features are observed in the Al-enriched regime during annealing at intermediate temperatures, whose causes are ascribed to the presence of secondary nucleation events and possibilities of structural relaxations in the amorphous matrixes when crystallizing.

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Section: Methodsmentioning

confidence: 99%

“…As seen in Figure 1 and the Al-enriched 660 °C transformation, this process seemingly culminates after about 40% of the volume fraction has finished. Mechanistically, the hampering of diffusion in amorphous solids relates to an increased viscosity of the matrix, 20,61,72,78 which can be expressed from the Stokes−Einstein relation 97…”

mentioning

confidence: 99%

Circumventing Thermodynamic Constraints in Nucleation-Controlled Crystallization of Al₂TiO₅-Based Chemical Vapor Deposition Coatings

Öhman

Nagy

et al. 2022

Chem. Mater.

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“…B/Si-added could effectively retard the atomic segregation/enrichment/crystallization, promoting the formation of APs. 37 APs were formed due to the increasing of the lattice distortions and the poor driving force of the crystallization/growth, enhancing the surface hardness/elastic modulus of this coating by the solution strengthening; the Ni-Si/Ti-Si nanocrystals were produced due to in situ reactions, reducing the stress concentration and the formation/propagation of cracks, improving the compatibility of grain boundaries. 38 As shown in Figure 3F, the high temperature oxidation resistance of this coating was investigated by measuring the oxidation mass gain versus the oxidation time.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 3E shows that the amorphous rings and the nanoscale phases were formed in the selected area electron diffraction (SAED) pattern of specimen 1. B/Si‐added could effectively retard the atomic segregation/enrichment/crystallization, promoting the formation of APs 37 . APs were formed due to the increasing of the lattice distortions and the poor driving force of the crystallization/growth, enhancing the surface hardness/elastic modulus of this coating by the solution strengthening; the Ni–Si/Ti–Si nanocrystals were produced due to in situ reactions, reducing the stress concentration and the formation/propagation of cracks, improving the compatibility of grain boundaries 38 .…”

Section: Resultsmentioning

confidence: 99%

Microstructure performance enhancement of Si₃N₄ reinforced laser clad KF110 base composite coatings

Zhang

Sun

et al. 2021

Int J Applied Ceramic Tech

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The KF110-Si 3 N 4 -La 2 O 3 -Cu composite coatings were fabricated on TA2 by a laser cladding (LC). Microstructure, elemental distribution, high temperature oxidation, and wear resistance were investigated. Research results showed that the nanocrystalline phases (NPs) and the amorphous phases (APs) were formed due to the existence of the short atomic radius elements/fast cooling rate during an LC process; the uniform distributed NPs with the high interface energy were produced due to an addition of Cu, enhancing wear resistance of an LC coating. Lattice distortions were produced due to high temperature of a laserinduced pool (LIP). Addition of the alloy elements enhanced high temperature oxidation resistance of this coating. Excessive addition of Si 3 N 4 caused defects to be produced, enhancing the brittleness of this coating.

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“…However, other elements can also be added to improve the formation of nanocrystalline phases and, therefore, also improve the magnetic behaviour of the alloy. Elements such as B, P, or Si [11,12] are amongst those that can improve magnetic behaviour by favouring nanocrystalline state [13]. Nevertheless, unwanted phases may appear in the alloy after manufacturing as a consequence of the addition of elements such as B, P, or Si to the alloy.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Analysis of Nanocrystalline Soft Magnetic Alloys: Fe Based

Daza

Mbarek

Escoda

et al. 2021

Metals

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Soft magnetic nanocrystalline alloys have been widely analysed and studied during the past years. However, optimisation of specific chemical compositions is still being developed. The applicability of these soft nanocrystalline alloys depends mainly on the presence of the desired nanocrystalline phases within the alloy. In this study, the analysed alloys are manufactured by mechanical alloying. The analyses performed on the samples include a microstructural analysis, a thermal analysis, and a complementary functional analysis in the form of the thermomagnetic response of some samples. Regarding Fe-based alloys, thermal stability for samples containing B was higher than those containing P (crystal growth peaks in the range between 895–905 K and 775–800 K respectively). The higher magnetization of saturation, Ms, was found in Fe–Mn alloys, whereas the addition of boron provoked a decrease of Ms and the nanocrystals size.

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Effects of Si/B ratio on the isothermal crystallization behavior of FeNiSiBCuNb amorphous alloys

Cited by 10 publications

References 32 publications

Circumventing Thermodynamic Constraints in Nucleation-Controlled Crystallization of Al₂TiO₅-Based Chemical Vapor Deposition Coatings

Circumventing Thermodynamic Constraints in Nucleation-Controlled Crystallization of Al₂TiO₅-Based Chemical Vapor Deposition Coatings

Microstructure performance enhancement of Si₃N₄ reinforced laser clad KF110 base composite coatings

Characterization and Analysis of Nanocrystalline Soft Magnetic Alloys: Fe Based

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Effects of Si/B ratio on the isothermal crystallization behavior of FeNiSiBCuNb amorphous alloys

Cited by 10 publications

References 32 publications

Circumventing Thermodynamic Constraints in Nucleation-Controlled Crystallization of Al2TiO5-Based Chemical Vapor Deposition Coatings

Circumventing Thermodynamic Constraints in Nucleation-Controlled Crystallization of Al2TiO5-Based Chemical Vapor Deposition Coatings

Microstructure performance enhancement of Si3N4 reinforced laser clad KF110 base composite coatings

Characterization and Analysis of Nanocrystalline Soft Magnetic Alloys: Fe Based

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Circumventing Thermodynamic Constraints in Nucleation-Controlled Crystallization of Al₂TiO₅-Based Chemical Vapor Deposition Coatings

Circumventing Thermodynamic Constraints in Nucleation-Controlled Crystallization of Al₂TiO₅-Based Chemical Vapor Deposition Coatings

Microstructure performance enhancement of Si₃N₄ reinforced laser clad KF110 base composite coatings