Cast iron (CI) based soft magnetic BMG Ci88.3Al2Ga1P4.35B4.35

Abstract

Thermal stability, structure, and magnetic properties of bulk type Ci(88.3)Al(2)Ga(1)P(4.35)B(4.35) alloy in ribbon form have been studied using differential thermal analysis, x-ray diffraction and magnetic measurements. Results reveal that crystallization peak temperature (T-x) and Curie temperature (T-c) of the as-cast alloy are respectively 513 and 370 degrees C. Crystallization of the specimen starts after annealing at 460 degrees C and alpha-Fe is precipitated out. Annealing at temperatures higher than 515 C-degrees, produces apart from a-Fe, hard magnetic precipitants (Fe2B, Fe3B), which deteriorate the soft magnetic properties. Lowest coercive field - 9.8 A/m, highest saturation of induction - 1.55 Tesla and best losses - 0.42 W/kg (at 50 Hz and 0.4 kA/m) were obtained for as-cast specimen. Observed good soft magnetic properties of these low cost cast-iron based alloys suggest perspective applications of these soft magnetic alloys as an alternative to the conventional Fe-Si electrical steel and Mn-Zn ferrites.