Evaluation of the microstructure and magnetic properties of Fe 73Me 5Y 3B 19 (where Me = Ti or Nb) amorphous alloys

Abstract

The results of microstructure and magnetic properties studies of the amorphous Fe 73Me 5Y 3B 19 (where Me = Ti or Nb) alloys are presented The samples of the investigated alloys were produced in the form of ribbons with thickness of approximately 30 μm by unidirectional cooling of the liquid material on a rotating copper wheel. Both investigated alloys, in the as-quenched state, were fully amorphous which was verified using a 'Bruker' X-ray diffractometer. Static hysteresis loops, measured using 'LakeShore' vibrating sample magnetometer (VSM), were typical as for soft magnetic ferromagnets. The Fe 73Nb 5Y 3B 19 and Fe 73Ti 5Y 3B 19 alloys were characterized by relatively high values of saturation of the magnetization (1.25 T and 1.26 T, respectively) and low coercivity field (16 A/m and 47 A/m, respectively). The core losses obtained for the investigated alloys were significantly lower than for commercially used FeSi transformer steels. Both alloys also exhibited excellent time and temperature stability of the magnetic properties (within the investigated temperature range), as confirmed by measurements of magnetic susceptibility and its disaccommodation.