Bulk amorphous Fe-Ga-P-B-C alloys with a large supercooled liquid region

Amorphous Fe75Ga5P12C4B4 alloy rods were prepared in the diameter range up to 1.0 mm by copper mold casting. The glass transition temperature (T-g), supercooled liquid region (Delta T-x(= T-x - T-g)) and reduced glass transition temperature (T-g/T-m) of the amorphous alloy rods are 731 K, 37 K and 0.61, respectively, in agreement with the results for the corresponding melt-spun amorphous alloy ribbon. The Curie temperature (T-c), saturated magnetization (I-s), coercive force (H-c) and saturated magnetostriction (lambda(s)) of the melt-spun amorphous ribbon are 622 K-t 1.28T, 1.6 A/m and 19.6 x 10(-6), respectively, in which the T-c and I-s are nearly the same as those for the amorphous alloy rod with a diameter of 0.5 mm. The simultaneous achievement of high T-g/T-m, large Delta T-x and good soft magnetic properties for the simple Fe-based alloy system is promising for the future development of bulk amorphous Fe-based soft magnetic alloys.