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This paper presents the results of tests on amorphous alloys Fe65Co10Y5B20, Fe63Co10Y7B20 in the state after solidification and after thermal treatment. The thermal treatment was performed below the crystallization temperature and above the Curie temperature (750K/25 min). The samples for the investigation had the shape of rods with a diameter of 1 mm and a length of 20 mm. The structure and magnetic properties were studied for the research material. The structure was investigated using XRD and the magnetic properties using VSM and FERROTESTER. XRD studies showed that the samples both in solidified state and after thermal treatment had an amorphous structure. The losses for the re-magnetization of the tested samples were comparable to those for commercially used FeSi materials. The process of magnetization in the vicinity of the area called the approach to ferromagnetic saturation is associated with all tested samples with rotation of the magnetization vector near free volumes. An interesting result of the conducted research is that not always a thermal treatment made on general principles leads to improvement of magnetic.

Effect of Heat Treatment on Magnetic Properties of Bulk Amorphous Alloys Fe63+xCo10Y7-xB20 (x=0, 2)