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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2006

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Structure and properties of the powder obtained from the amorphous ribbon

Konieczny J., Dobrzański L. A., Frąckowiak J. E.

Journal of Achievements in Materials and Manufacturing Engineering

2006

Vol. 18, nr 1-2

143--146

Purpose: The aim of the work is to investigate the magnetic properties of the cobalt based Co68Fe4Mo 1Si13.5 B13.5 amorphous alloy subjected to the isothermal annealing, high-energy milling and to a combination of these two technologies. Design/methodology/approach: The powder test piece obtained from the input amorphous ribbon in high-energy ball milling. Distributions of the magnetic hyperfine P(H) fields were determined for spectra smoothed in this way, by using the HFQS program, employing the Hesse-Rübartsch method. The diffraction examinations and examinations of thin foils were made on the JEOL JEM 200CX transmission electron microscope. Observations of the structure of powders were made on the Opton DSM-940 scanning electron microscope. Findings: The analysis of the magnetic properties test results of the of the Co68Fe4Mo 1Si13.5B13.5 powders obtained in the high-energy ball of milling process proved that the process causes significant decrease in the magnetic properties. The structure and magnetic properties of this material may be improved by means of a proper choice of parameters of this process as well as the final thermal treatment. Research limitations/implications: For the powders, further magnetical, structure and composition examinations are planed. Practical implications: The amorphous and nanocrystalline metal powders obtained by milling of metallic glasses feature an alternative to solid alloys and make it possible to obtain the ferromagnetic nanocomposites, whose shape and dimensions can be freely formed. Originality/value: The paper presents influence of parameters of the high-energy ball milling process on structure and magnetic properties of soft magnetic powder materials obtained in this technique. The paper compares structure and magnetic properties of the Co 68Fe4Mo 1Si13.5B13.5 alloy obtained in high-energy ball milling process and melt spinning technique.