Structure and Properties of FeCoNCuB Nanocrystalline Alloys |
| K. Jeż
Department of Physics, Częstochowa University of Technology, al. Armii Krajowej 19, 42-200 Częstochowa, Poland |
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| This paper presents the results of research on the structure of bulk rapidly-cooled alloys. The investigated alloys, with the general formula: Fe45+xCo25-xNb9Cu1B20, were produced using the injection-casting method. The materials were produced in the form of two sets of rods with diameters of either 0.5 mm or 1 mm. Structural studies confirmed that the alloys have a nanocrystalline structure. The following crystalline phases were identified within the volume of the alloys: α-Fe, Fe23B6 and Co23B6, with the last two phases mixed with each other. Additionally, in the alloy samples with a diameter of 1 mm, an unidentified crystalline phase was formed during the solidification process. The magnetic properties of the alloys were determined on the basis of measurements associated with their primary magnetisation curves and static magnetic hysteresis loops. It was found that the addition of Fe, at the expense of Co, reduces the value of the coercive field. Moreover, the 1 mm diameter alloy samples were found to exhibit inferior soft magnetic properties, compared to the 0.5 mm diameter samples. The higher value of the coercivity field, determined for the Fe45Co25Nb9Cu1B20 alloy, is believed to be associated with the presence of residual ordering with hard magnetic properties. For the investigated alloy samples, the process of magnetisation in strong magnetic fields is associated with the suppression of thermally-excited spin-waves. |
DOI:10.12693/APhysPolA.139.499 topics: rapidly-quenched alloys, nanocrystalline alloys, X-ray diffractometry, Fe23B6, injection-casting method |