Crystallization kinetics and soft magnetic properties in metalloid-free (Fe, Co)90Zr10 amorphous and nanocrystalline alloys

Blázquez, J.S.; Ipus, J.J.; Conde, C.F.; Cabrera, David; Franco, V.; Conde, A.

doi:10.1016/j.jallcom.2014.01.095

Cited by 5 publications

(5 citation statements)

References 20 publications

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“…The absolute value of the switching field increases from 430 A m −1 at room temperature up to 770 A m −1 at 403 K. Above this temperature, the magnetic bistability is lost due to the transition of the amorphous matrix into the paramagnetic state. Such a huge variation (more than 79%) in a rather narrow temperature range results from the loss of coupling between the ferromagnetic grains with increasing temperature, which has been observed in soft magnetic nanocrystalline materials . In general, the exchange ferromagnetic length L ex in nanocrystalline materials is expressed as

L_{ex} = {true(\frac{γ A}{true〈 K true〉} true)}^{\frac{1}{2}},

where γ is the scaling parameter, A is the exchange stiffness constant and <K> is the average structural anisotropy.…”

Section: Resultsmentioning

confidence: 99%

Addition of molybdenum into amorphous glass‐coated microwires usable as temperature sensors in biomedical applications

Hudák¹,

Varga

Poláček³

et al. 2015

Physica Status Solidi (a)

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Compared to other sensors, such as radio‐frequency identification sensors, microwires have a significant advantage due to their small dimensions and contact‐free reading. The most important advantage is that a microwire is considered to be a biocompatible material due to the glass‐coating insulator. This is particularly applicable in various titanium implants (dental, knee joint, replacement of damaged skull part, repair of the femur, etc.). The temperature dependence of the switching field can be employed to monitor inflammatory processes. In this contribution we present the influence of molybdenum (Mo) content on the magnetic properties and thermal treatment in order to obtain a strong variation of the switching field to temperature. We show that stress annealing of a FeMo9BCu microwire at 775 K under an applied axial stress of 309 MPa leads to the strongest variation in a temperature range from 300 to 315 K, which is highly desirable for biomedical applications.

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L_{ex} = {true(\frac{γ A}{true〈 K true〉} true)}^{\frac{1}{2}},

where γ is the scaling parameter, A is the exchange stiffness constant and <K> is the average structural anisotropy.…”

Section: Resultsmentioning

confidence: 99%

Addition of molybdenum into amorphous glass‐coated microwires usable as temperature sensors in biomedical applications

Hudák¹,

Varga

Poláček³

et al. 2015

Physica Status Solidi (a)

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“…This can be done analogously as for n* but substituting in Eq. (10) X for [20], the Avrami exponents of the first process could be explained due to three dimensional growth controlled by diffusion for both alloys but with the presence of quenched in nuclei for the Co-free alloy. The low values of the Avrami exponent of the second process in both alloys, ~1.7, could be understood as due to the presence of quenched in nuclei of the intermetallic phase or to a sudden saturation of the nucleation sites for this phase.…”

Section: Comparison To Experimental Datamentioning

confidence: 91%

“…In order to test the viability of the proposed analysis, crystallization of two amorphous Microstructure and magnetic properties of these alloys can be found elsewhere [20].…”

Section: Comparison To Experimental Datamentioning

confidence: 99%

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On the use of classical JMAK crystallization kinetic theory to describe simultaneous processes leading to the formation of different phases in metals

Blázquez

Conde

2015

International Journal of Thermal Sciences

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The classical theory of Johnson-Mehl-Avrami-Kolmogorov (JMAK) is widely used to describe the kinetics of crystallization even when the premises required for its application are not strictly fulfilled. In this paper we propose a procedure to obtain the JMAK parameters of the independent transformations that simultaneously occur during a crystallization process (e.g. leading to the formation of several crystalline phases). The predictions of the analysis have been used to describe the crystallization process of two amorphous alloys with Fe 90 Zr 10 and (Fe 0.7 Co 0.3 )Zr 10 composition, respectively, which consists of two overlapped processes ascribed to the formation of -Fe(Co) phase and a Zr-rich intermetallic.

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“…This analysis has been applied to the crystallization of different amorphous Fe(Co)-Zr [75,76] and Fe-Nb [77] alloys. Moreover, the assumption of multiple overlapped microprocesses reproduces the low Avrami exponents found in nanocrystallization.…”

Section: Independent Geometrical Impingementmentioning

confidence: 99%

A Review of Different Models Derived from Classical Kolmogorov, Johnson and Mehl, and Avrami (KJMA) Theory to Recover Physical Meaning in Solid‐State Transformations

Blázquez

Romero

Conde

et al. 2022

Physica Status Solidi (b)

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The classical theory of solid‐state transformation based on nucleation and growth processes, developed by Kolmogorov, Johnson and Mehl, and Avrami (KJMA theory), is widely used in many different fields of research. In KJMA theory, two parameters (the frequency factor and, particularly, the Avrami exponent) can supply information about the mechanisms involved in the transformation. Despite its apparent simplicity, on the one hand, the results derived from this theory can be strongly affected by the indetermination of experimental data (e.g., onset of the transformation). On the other hand, KJMA theory is developed for isothermal polymorphic transformations in which randomly distributed nuclei grow in convex shapes. However, several procedures have extended KJMA theory to nonisothermal regimes and to many different processes deviating from those premises. Herein, the requirements of KJMA theory and the expected deviations for these approximations are briefly discussed. In addition, some strategies are proposed for recovering physical meaning from the effective parameters deduced in several transformations including nanocrystallization and martensitic transformations for which results can be interpreted under the approximation of instantaneous growth.

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Crystallization kinetics and soft magnetic properties in metalloid-free (Fe, Co)90Zr10 amorphous and nanocrystalline alloys

Cited by 5 publications

References 20 publications

Addition of molybdenum into amorphous glass‐coated microwires usable as temperature sensors in biomedical applications

Addition of molybdenum into amorphous glass‐coated microwires usable as temperature sensors in biomedical applications

On the use of classical JMAK crystallization kinetic theory to describe simultaneous processes leading to the formation of different phases in metals

A Review of Different Models Derived from Classical Kolmogorov, Johnson and Mehl, and Avrami (KJMA) Theory to Recover Physical Meaning in Solid‐State Transformations

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