Crystallisation kinetics of B-rich mischmetal–Fe–B

F. D. SACCONE; C. E. RODRIGUEZ TORRES; G. A. PASQUEVICH; M. B. FERNÁNDEZ VAN RAAP; F.H. SÁNCHEZ

PHYSICA B - CONDENSED MATTER

Año: 2004 vol. 354 p. 237 - 240

0921-4526

The crystallisation kinetics of MM2.5Fe79B18.5 (MM=Mischmetal), was followed by means of Mo¨ ssabuer effect experiments at constant acceleration, Mo¨ ssbauer thermal scan, thermomagnetic and calorimetric measurements.It was determined that the as-quenched ribbons are amorphous with a Tc of 668K and the crystallisation, at low heating rates, occurs in two steps: in the .rst step, it precipitates a dilute a-(Fe, RE) solid solution, while in the second Fe2B and more a-(Fe, RE) are crystallised from the remnant Fe-impoverished amorphous matrix.