It was shown in [1] that bulk nanocrystalline Pr-Fe-Co-Zr-Ti-B alloys produced directly by various rapid solidification techniques were hard magnetic in as-cast state. However, values of magnetic parameters depend on the geometric dimensions of the samples. In the present work the changes of microstructure and phase constitution of the Pr₉Fe₆₀Co₁₃Zr₁Ti₃B₁₄ alloy samples of various sizes were investigated. The nanocrystalline 1 mm diameter rods and 3 mm outer diameter tubes were produced by suction-casting of the melt into the water cooled copper die under an Ar atmosphere. For comparison the nanocrystalline ribbon in as-cast state of the thickness t_r~140μm, were produced by controlled atmosphere melt-spinning. The X-ray difractometry and quantitative analysis of the Mössbauer spectra, shown differences in phase constitution of the samples of various shapes. Furthermore, the transmission electron microscopy revealed differences in microstructure of the rod, tube and ribbon samples. The aim of the work was to determine the correlations between the cooling rate, microstructure, phase constitution and magnetic properties of the Pr₉Fe₆₀Co₁₃Zr₁Ti₃B₁₄ alloy samples.

Work supported by the research project No N N507 372 735 financed by Polish Ministry of Science and Higher Education in years: 2008-2011.

[1] P. Pawlik, K. Pawlik, H.A. Davies, W. Kaszuwara, J.J. Wysłocki, N. Harrison, I. Todd, Journal of Alloys and Compounds 423 (2006) 99–101

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