ACTA

Crystallization Processes of R_4.5Fe₇₇B_18.5 (R = Pr, Nd) Amorphous Alloys

A. Musiał^a,b, Z. Śniadecki^a, D. Pagnani^a, B. Idzikowski^a
^aInstitute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland
^bThe NanoBioMedical Centre, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

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The amorphous alloys R_4.5Fe₇₇B_18.5 (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 diffraction (XRD) and differential scanning calorimetry (DSC). Temperatures of crystallization for Pr_4.5Fe₇₇B_18.5, measured at the heating rate 20 K/min, are equal T_x1=591°C for the first exothermic effect and T_x2=603°C for the second one (for Nd_4.5Fe₇₇B_18.5 T_x1=594°C and T_x2=633°C). In the amorphous ribbons the crystallization of Fe₃B phase in the first step, followed by the crystallization of Pr₂Fe₂₃B₃ and Nd₂Fe₂₃B₃, was observed. Both later phases appear in the process of recrystallization, immediately after Fe₃B formation.

DOI: 10.12693/APhysPolA.126.316
PACS numbers: 61.43.Dq, 65.60.+a, 75.50.Bb