Variation of permeability of Nb-poor Finemet under different field amplitudes

Determine optimal annealing temperature of Fe based nanocrystalline alloys from their melting point

“…Moreover, it is also known that Fe based nanocrystalline alloys have special two-phase structures (amorphous matrix and inserted nanocrystals), generally obtained from their amorphous precursors after annealing. Furthermore, the grain size D greatly depends on the annealing conditions, especially the temperature;7 therefore, it is predicted that the permeability would definitely have a close relationship with the annealing temperature. Generally speaking, the grain size increases with the annealing temperature;8 – 10 thus, we can infer from it that the permeability should decrease with increasing annealing temperature, according to the random anisotropy theory 6.…”

Structural and magnetic properties of Fe73.5Cu1Nb3−xTixSi13.5B9 (x≤3) alloys

“…Generally, Nb is considered as an essential composition element to hinder crystal growth [6], resulting in the formation of nanocrystalline ␣-Fe(Si) phase with grain size less than the ferromagnetic correlation length (L ex = 35 nm) [7]. In order to further improve the soft magnetic properties and to reduce the cost of materials, various researches on the substitution effects of Nb by Mo, V, Mn, Cr and Al have been conducted [8][9][10][11][12]. This work attempts to investigate the substituting effects of Ti for Nb in Fe 73.5 Cu 1 Nb 3−x Ti x Si 13.5 B 9 (x = 0, 1, 2, 3) alloys on the crystallization behaviors, microstructure and magnetic properties.…”