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Phase precipitation and isothermal crystallization kinetics of FeZrB amorphous alloy

Phase precipitation and isothermal crystallization kinetics of FeZrB amorphous alloy The crystallization process of Fe78Zr7B15 (at%) amorphous ribbon was investigated by X-ray diffraction (XRD), differential scanning calorimetry and scanning electron microscopy (SEM). The fully amorphous structure of as-quenched (Aq) ribbons was confirmed by XRD pattern. The saturation magnetization (M s) and Curie temperature of the Aq ribbon were measured as 124.3 (A·m2)/kg and 305 °C with vibrating sample magnetometer (VSM), respectively. When the ribbons was annealed at 550 °C near the first onset temperature (T x1 = 564.9 °C), the M s was increased by 17 %, which was caused by the formation of a dual phase structure. The isothermal crystallization kinetics and crystallization mechanism of primary α-Fe phase in the dual phase structure were studied by Arrhenius and Johnson-Mehl-Avrami-Kolmogorov equations respectively. The results showed that the crystallization of α-Fe phase was a diffusion-controlled surface nucleation growth process, and the nucleation rate decreased with longer crystallization time. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advances in Manufacturing Springer Journals

Phase precipitation and isothermal crystallization kinetics of FeZrB amorphous alloy

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References (31)

Publisher
Springer Journals
Copyright
Copyright © 2013 by Shanghai University and Springer-Verlag Berlin Heidelberg
Subject
Engineering; Manufacturing, Machines, Tools; Control, Robotics, Mechatronics; Nanotechnology and Microengineering
ISSN
2095-3127
eISSN
2195-3597
DOI
10.1007/s40436-013-0033-2
Publisher site
See Article on Publisher Site

Abstract

The crystallization process of Fe78Zr7B15 (at%) amorphous ribbon was investigated by X-ray diffraction (XRD), differential scanning calorimetry and scanning electron microscopy (SEM). The fully amorphous structure of as-quenched (Aq) ribbons was confirmed by XRD pattern. The saturation magnetization (M s) and Curie temperature of the Aq ribbon were measured as 124.3 (A·m2)/kg and 305 °C with vibrating sample magnetometer (VSM), respectively. When the ribbons was annealed at 550 °C near the first onset temperature (T x1 = 564.9 °C), the M s was increased by 17 %, which was caused by the formation of a dual phase structure. The isothermal crystallization kinetics and crystallization mechanism of primary α-Fe phase in the dual phase structure were studied by Arrhenius and Johnson-Mehl-Avrami-Kolmogorov equations respectively. The results showed that the crystallization of α-Fe phase was a diffusion-controlled surface nucleation growth process, and the nucleation rate decreased with longer crystallization time.

Journal

Advances in ManufacturingSpringer Journals

Published: Jul 26, 2013

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