Crystallization Processes of R4.5Fe₇₇B18.5 (R = Pr, Nd) Amorphous Alloys

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The amorphous alloys R4.5Fe77B18.5(R=Pr, Nd) were prepared by melt-spinning technique under argon atmosphere on a cooper wheel rotating with surface velocity of 25 m•s -1 .The ribbons have been investigated by means of X-ray diraction (XRD) and dierential scanning calorimetry (DSC).Temperatures of crystallization for Pr4.5Fe77B18.5,measured at the heating rate 20 K/min, are equal Tx1 = 591 • C for the rst exothermic eect and Tx2 = 603 • C for the second one (for Nd4.5Fe77B18.5Tx1 = 594 • C and Tx2 = 633 • C).In the amorphous ribbons the crystallization of Fe3B phase in the rst step, followed by the crystallization of Pr2Fe23B3 and Nd2Fe23B3, was observed.Both later phases appear in the process of recrystallization, immediately after Fe3B formation.