Title :
The influence of nanocrystalline microstructure on the magnetic properties of a wire shaped ferromagnetic alloy
Author :
Gómez-Polo, C. ; Olofinjana, A.O. ; Marin, P. ; Vazquez, Manuel ; Davies, H.A.
Author_Institution :
Inst. de Ciencia de Mater., Madrid, Spain
fDate :
11/1/1993 12:00:00 AM
Abstract :
The magnetic properties of nanocrystalline Fe73.5Cu1Nb3Si13.5B9 alloy wire are reported. The evolution of the structure and of the magnetic properties of the wire is studied as a function of annealing temperature, Tann. In the as-cast glassy state, the wires show typical bistable magnetic behavior while, after devitrification to a nanocrystalline structure based on α-FeSi grains of mean diameter ~10 nm (Tann=550°C), the coercivity and magnetostriction decrease substantially and bistability is lost. The bistability could be recovered on application of a torsional stress. Treatment at Tann>600°C leads to grain growth and eventually to precipitation of ultrafine boride, resulting in drastic magnetic hardening
Keywords :
annealing; boron alloys; coercive force; copper alloys; crystallisation; ferromagnetic properties of substances; grain growth; iron alloys; magnetic hysteresis; magnetic properties of amorphous substances; magnetostriction; melt spinning; metallic glasses; nanostructured materials; niobium alloys; silicon alloys; 20 to 650 C; Fe73.5Cu1Nb3Si13.5B 9; amorphous alloy; annealing temperature; as-cast glassy state; bistable magnetic behavior; coercivity; devitrification; grain growth; hysteresis loops; magnetic hardening; magnetic properties; magnetostriction; melt spinning; nanocrystalline microstructure; precipitation; torsional stress; ultrafine boride; wire shaped ferromagnetic alloy; Annealing; Copper alloys; Iron alloys; Magnetic properties; Magnetostriction; Microstructure; Niobium alloys; Silicon alloys; Temperature; Wire;
Journal_Title :
Magnetics, IEEE Transactions on
