Title :
Quenching-rate dependence of the magnetic and mechanical properties of nanocrystalline Fe73.5Cu1Nb3Si13.5B9 ribbons obtained by Joule heating
Author :
Allia, Paolo ; Tiberto, Paola ; Baricco, Marcello ; Knobel, Marcelo ; Vinai, Franco
Author_Institution :
Dipartimento di Fisica, Politecnico di Torino, Italy
fDate :
3/1/1994 12:00:00 AM
Abstract :
Four Fe73.5Cu1Nb3Si13.5B9 ribbons obtained by melt spinning with different quenching rates were submitted to direct current (DC) Joule-heating treatment in vacuum. On-line measurements of the electrical resistance were performed in the course of Joule heating in order to study the development of the nanocrystalline phase. The results show that the nanocrystallization kinetics is strongly dependent on the initial degree of structural disorder. The increase in both initial magnetic permeability and brittleness upon nanocrystallization were observed to be affected by the initial topological disorder
Keywords :
boron alloys; brittleness; copper alloys; electrical conductivity measurement; electrical conductivity of crystalline metals and alloys; ferromagnetic properties of substances; heat treatment; iron alloys; magnetic permeability; magnetic properties of fine particles; magnetomechanical effects; nanostructured materials; niobium alloys; silicon alloys; Fe73.5Cu1Nb3Si13.5B 9; Joule heating; brittleness; electrical resistance; magnetic permeability; melt spinning; nanocrystalline ribbons; quenching rates; structural disorder; Electric resistance; Electric variables measurement; Electrical resistance measurement; Iron; Mechanical factors; Niobium; Performance evaluation; Phase measurement; Resistance heating; Spinning;
Journal_Title :
Magnetics, IEEE Transactions on
