The effect of niobium alloying additions on the crystallization of a Fe–Si–B–Nb alloy

Zhang, Y.R.; Ramanujan, R.V.

doi:10.1016/j.jallcom.2005.05.019

Cited by 38 publications

(12 citation statements)

References 30 publications

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“…As Zhang and Ramanujan [17] stated, iron replaced by niobium not only had a large effect on the crystallization temperature, but it also changed the magnetic properties. The saturation magnetization and the coercive force of studied Fe-based alloys after annealing at 373, 573, 773, and 823 K were measured by the VSM technique (Fig.…”

Section: Resultsmentioning

confidence: 98%

Magnetic Properties and Structure after Crystallization of Fe_80-xB₂₀Nb_x (x=4, 6, 10) Metallic Glasses

et al. 2017

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The ferromagnetic Fe-based amorphous alloys were studied due to properties for soft magnetic applications. Depending on different Nb addition, the formation of crystalline phases after annealing of amorphous Fe80−xB20Nbx (x = 4, 6, 10) alloys was studied. The crystallization products as well as the phase structure were determined using the Mössbauer spectrometry combined with differential scanning calorimetry and magnetic measurements. The addition of Nb caused a shift of crystallization process towards higher temperatures and induced changes in coercive force and decreased the saturation magnetization. It was found that Nb addition changed the crystallization process from single crystallization for Fe76B20Nb4 alloy to binary crystallization in the Fe74B20Nb6 and Fe70B20Nb10 glasses. The annealing process at the onset crystallization temperature induced complex phase formation including the α-Fe, Fe3B, and Fe2B phases for alloys x = 4, 6.

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Section: Resultsmentioning

confidence: 98%

Magnetic Properties and Structure after Crystallization of Fe_80-xB₂₀Nb_x (x=4, 6, 10) Metallic Glasses

et al. 2017

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“…In this paper the microstructures of the melt-spun Fe 66 Cu 6 [12]. Partial substitution of iron with copper was expected to induce liquid phase separation due to a positive heat of mixing (Table 1).…”

Section: Introductionmentioning

confidence: 91%

Structure of the Amorphous-Crystalline Fe66Cu6B19Si5Nb4 Alloy Obtained by the Melt-Spinning Process

Kozieł¹,

Latuch²,

Zielińska‐Lipiec³

2013

Archives of Metallurgy and Materials

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This paper presents structure investigations of the rapidly cooled Fe 66 Cu 6 B 19 Si 5 Nb 4 alloy. A proper selection of chemical composition enabled in-situ formation of the amorphous-crystalline composite during the melt spinning process. Liquid phase separation into the Fe-rich and the Cu-rich phases was confirmed. The microstructures of alloy, melt-spun from 1723 and 1773 K, are composed of the Fe-rich amorphous matrix and Cu-rich spherical crystalline precipitates. For the higher melt-ejection temperature, no coarse precipitates could be observed. Amorphous nature of the Fe-rich matrix was confirmed by presence of a broad diffraction maximum on the X-ray diffraction patterns, a halo ring on the electron diffraction pattern as well as presence of exothermic effects, related to the crystallization of the Fe-rich amorphous matrix, in the differential scanning calorymetry. Beside presence of copper, revealing positive heat of mixing with iron, relatively large supercooled liquid region, was noticed.Keywords: metallic glasses, amorphous-crystalline composites, melt-spinning Praca przedstawia badania kompozytu amorficzno-krystalicznego otrzymanego w stopie Fe 66 Cu 6 B 19 Si 5 Nb 4 . Badania obejmowały rentgenowską analizę fazową (XRD), skaningową kalorymetrię różnicową (DSC), mikroskopię świetlną (LM), skaningową mikroskopię elektronową (SEM) i transmisyjną mikroskopię elektronową (TEM). Odpowiedni dobór składu chemicznego umożliwił uzyskanie kompozytu amorficzno-krystalicznego dzięki wykorzystaniu zjawiska podziału w stanie ciekłym w efekcie dodatniego ciepła tworzenia roztworu pomiędzy żelazem i miedzią. Mikrostruktury badanego stopu, po odlaniu z temperatury 1723 i 1773 K, składają się z amorficznej osnowy bogatej w żelazo i krystalicznych kulistych wydzieleń bogatych w miedź. Dla wyższej temperatury odlewania nie obserwowano dużych wydzieleń. Obecność fazy amorficznej została potwierdzona poprzez obecność halo na dyfrakcji elektronowej oraz efekt cieplny egzotermiczny w badaniach skaningowej kalorymetrii różnicowej, związany z krystalizacją osnowy bogatej w żelazo. Pomimo dodatku miedzi, wykazującej dodatnie ciepło tworzenia roztworu z żelazem, wyznaczony zakres cieczy przechłodzonej jest względnie duży.

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“…Presence of Cu and Nb atoms was found to be crucial for nanocrystallization [57]. Cu increases nucleation rate forming clusters with near-fcc symmetry, on whose surface α-Fe(Si) crystals are formed [6], while Nb reduces crystal growth rate [7].…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability and Mechanism of Thermally Induced Crystallization of Fe_73.5Cu₁Nb₃Si_15.5B₇Amorphous Alloy

et al. 2015

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Investigation of thermal stability of the alloy revealed stepwise crystallization process, manifested by two distinct complex exothermic peaks in dierential scanning calorimetry curves. Kinetic parameters of individual crystallization steps were found using the Kissinger and Vyazovkin methods. Structural characterization of thermally treated samples showed formation of dierent iron-based phases including α-Fe(Si), Fe2B, Fe16Nb6Si7 and Fe2Si and some metastable intermediary species. Morphology characterization of the surface and cross-section of the thermally treated samples showed granulated structure composed of several dierent phases and indicated occurrence of impingement eects during crystal growth. Value of estimated lifetime suggested very high stability against crystallization at room temperature and abrupt decrease of lifetime with temperature increase.

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The effect of niobium alloying additions on the crystallization of a Fe–Si–B–Nb alloy

Cited by 38 publications

References 30 publications

Magnetic Properties and Structure after Crystallization of Fe_80-xB₂₀Nb_x (x=4, 6, 10) Metallic Glasses

Magnetic Properties and Structure after Crystallization of Fe_80-xB₂₀Nb_x (x=4, 6, 10) Metallic Glasses

Structure of the Amorphous-Crystalline Fe66Cu6B19Si5Nb4 Alloy Obtained by the Melt-Spinning Process

Thermal Stability and Mechanism of Thermally Induced Crystallization of Fe_73.5Cu₁Nb₃Si_15.5B₇Amorphous Alloy

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The effect of niobium alloying additions on the crystallization of a Fe–Si–B–Nb alloy

Cited by 38 publications

References 30 publications

Magnetic Properties and Structure after Crystallization of Fe80-xB20Nbx (x=4, 6, 10) Metallic Glasses

Magnetic Properties and Structure after Crystallization of Fe80-xB20Nbx (x=4, 6, 10) Metallic Glasses

Structure of the Amorphous-Crystalline Fe66Cu6B19Si5Nb4 Alloy Obtained by the Melt-Spinning Process

Thermal Stability and Mechanism of Thermally Induced Crystallization of Fe73.5Cu1Nb3Si15.5B7Amorphous Alloy

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Magnetic Properties and Structure after Crystallization of Fe_80-xB₂₀Nb_x (x=4, 6, 10) Metallic Glasses

Magnetic Properties and Structure after Crystallization of Fe_80-xB₂₀Nb_x (x=4, 6, 10) Metallic Glasses

Thermal Stability and Mechanism of Thermally Induced Crystallization of Fe_73.5Cu₁Nb₃Si_15.5B₇Amorphous Alloy