MICROSTRUCTURE AND HIGH-TEMPERATURE MAGNETIC-BEHAVIOR OF THE NANOCRYSTALLINE FE73.5CU1NB3SI13.5B9 ALLOY

The initial susceptibility, magnetic after-effect, and magnetic satura tion polarization in the temperature range from 290 to 700 K and the m icrostructure for the Fe73.5CU1Nb3Si13.5B9 alloy with a different volu me fractions of the crystalline phase are investigated. It is stated t hat after accumulative annealing only the short-range order occurs in the crystalline alpha-FeSi phase. The initial susceptibility increases and disaccommodation decreases with annealing time for the sample ann ealed at 743 K; these are attributed to the annealing-out of free volu mes. The amorphous matrix is the main source of the magnetic after-eff ect in all investigated samples.