Structural modification and phase transformation kinetics: crystallization of amorphous Fe40Ni40P14B6 eutectic alloy

The effect of processing histories (fluxing and pre-annealing) on the amorphous structure and the crystallization kinetics of amorphous Fe 40 Ni 40 P 14 B 6 alloy prepared by melt spinning has been studied by differential scanning calorimetry, X-ray diffraction, transmission and scanning electron mi...

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Bibliographic Details
Published in:Journal of materials science 2014, Vol.49 (2), p.842-857
Main Authors: Gu, Bin, Liu, Feng, Chen, Yu-Zeng, Jiang, Yi-Hui, Ma, Ya-Zhu
Format: Article
Language:English
Subjects:
Amorphous alloys
Amorphous structure
Annealing
Atomic structure
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallization
Crystallography and Scattering Methods
Differential scanning calorimetry
Diffraction
Eutectic alloys
Fluxing
Kinetics
Materials Science
Mathematical models
Melt spinning
Nucleation
Phase transitions
Polymer Sciences
Solid Mechanics
Structural analysis
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Summary:The effect of processing histories (fluxing and pre-annealing) on the amorphous structure and the crystallization kinetics of amorphous Fe 40 Ni 40 P 14 B 6 alloy prepared by melt spinning has been studied by differential scanning calorimetry, X-ray diffraction, transmission and scanning electron microscopy. For isothermal crystallization, an incubation time exists, and for isochronal crystallization, an abnormally sharp crystallization peak (with the transformed fraction corresponding to the transformation-rate maximum f p as less than 0.632) occurs. Subjected to fluxing and pre-annealing, the incubation time (in isothermal crystallization) decreases, whereas the initial crystallization temperature (in isochronal crystallization) declines as well as the less sharp crystallization peak and f p approaches 0.632. A kinetic model considering transient nucleation is proposed and analyzed, which could describe well the singular crystallization behavior of amorphous Fe 40 Ni 40 P 14 B 6 alloy. A recipe based on the kinetic model is also proposed to obtain the kinetic parameters from experiment data. Via kinetic analysis and amorphous structural characterization, it is considered that pre-annealing and fluxing promote relaxation of the system close to the meta-stable equilibrium state; the atomic structure becomes more similar to the correspondingly crystallized phase, thus declining the amorphous stability and alleviating the transient effect on nucleation.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-013-7768-9