Crystallization of amorphous Fe82P18

Author: Wei Bingoing   Li Yubao   Kohler-Redlich Philipp   Luck Reinhard   Ruhle Manfred  

Publisher: Springer Publishing Company

ISSN: 1543-1940

Source: Metallurgical and Materials Transactions A, Vol.31, Iss.4, 2000-04, pp. : 1067-1073

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Abstract

Magnetothermal analysis (MTA), high-resolution transmission electron microscopy (HRTEM), and X-ray diffraction (XRD) were employed to investigate the crystallization behavior of amorphous Fe82P18. Three transition stages with distinct microstructures were identified: lamellae of the supersaturated intermetallic compound Fe3P with about 5-nm width and varying composition are the result of the first transition (stage I); the growth of polygonal grains of about 100-nm size from the lamellae marks the second transition (stage II); and in the final stage III, grains of α-Fe are precipitated. The lamellar structure is formed by one-dimensional growth, as concluded from the Avrami exponent n, which was found to lie in the range 1.32≤n≤1.72. Analysis of the transformation kinetics from the characteristic isothermal transformation curves confirmed that the crystallization process depends very sensitively on the heat-treatment temperature.