Title :
Development of granular structure in Cu90Co10 ribbons through furnace and current annealing
Author :
da Silva, F.C.S. ; Knobel, M. ; Ferrari, E.F. ; Denardin, J.C. ; Miranda, M.G.M. ; Bracho, G.J. ; Antunes, A.B. ; Baibich, M.N.
Author_Institution :
Inst. de Fisica Gleb Wataghin, Univ. Estadual de Campinas, Sao Paulo, Brazil
fDate :
9/1/2000 12:00:00 AM
Abstract :
On-line measurements of resistance and temperature in melt-spun Cu 90Ca10 ribbons are made using two different annealing techniques: conventional furnace annealing, and linearly varying current Joule heating. The aim of this paper is to consider the electrical current, flowing through the sample during the annealing, as a possible parameter to control thermal treatment parameters and thus the microstructure of these systems. Although an exact way to obtain the temperature from the annealing current remains a difficult task, the on-line changes in resistance with current allows one to identify structural changes in the sample during annealing. Also, because the temperature is found to increase continuously with electrical current, it is possible to calibrate the Joule heating system to precisely determine the annealing temperature
Keywords :
annealing; cobalt alloys; copper alloys; crystal microstructure; electric resistance; granular structure; nanostructured materials; Cu90Co10; current annealing; electrical current; furnace annealing; granular structure; linearly varying current Joule heating; melt-spun material; microstructure; nanocrystalline materials; resistance; ribbons; thermal treatment; Amorphous materials; Annealing; Current measurement; Electric resistance; Electrical resistance measurement; Furnaces; Heat treatment; Microstructure; Resistance heating; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
