DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click HERE
to register or log in.
Magnetism, Structure and the Effects of Thermal Aging on (Fe1-xMnx)73.5Si13.5B9Nb3Cu1 Alloys
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
Amorphous alloys of Fe1-xMnx 73.5 Si13.5B9 Nb3Cu1, where chi 0, 0.05, 0.10, 0.15, were prepared by vacuum melt-spinning. Anneals performed at or above the crystallization temperature led to the formation of a nanostructure where the primary phase is a body centered cubic or DO3 FeSi phase embedded within an intergranular amorphous phase. The saturation induction of the chi 0.05 alloy is 1.19 T, slightly lower than the parent alloy. Prolonged thermal aging led to an enhancement in the soft magnetic properties. This change occurs at soak times near 6000 s and corresponds to a decrease in the anisotropy and coercivity, and an increase in the remanent magnetization. EXAFS studies suggest that the Mn partitions during crystallization and thermal aging to the grain boundary regions may play an important role in enhancing the exchange coupling of the aged samples by increasing the Curie temperature of the amorphous intergranular phase.
APPROVED FOR PUBLIC RELEASE