Title :
Heat treatments, microstructure and properties of internal-tin Nb/sub 3/Sn
Author :
Taillard, R. ; Verwaerde, C. ; Bruzek, C.E. ; Sulten, P.
Author_Institution :
Lab. de Metall. Phys., Lille I Univ., Villeneuve d´Ascq, France
fDate :
6/1/1997 12:00:00 AM
Abstract :
The decrease of temperature ramp rate during heat treatments of the internal tin process causes an increase of the critical current density at low and medium magnetic fields (4-16T). This paper investigates the metallurgical origin of this benefit by considering the effects of a change of heating rate on the phase transformations of bronze and on the filament recrystallization. The low temperature formation of Nb/sub 3/Sn is important for the critical current density of this material. This is explained by the composite microstructure evolution.
Keywords :
critical current density (superconductivity); crystal microstructure; heat treatment; niobium alloys; recrystallisation; superconducting magnets; superconducting materials; tin alloys; 4 to 16 T; Nb/sub 3/Sn; critical current density; filament recrystallization; heat treatment; internal-tin Nb/sub 3/Sn; low temperature formation; medium magnetic fields; microstructure; phase transformations; temperature ramp rate; Critical current density; Heat treatment; Heating; Magnetic fields; Magnetic properties; Microstructure; Niobium; Phase change materials; Temperature; Tin;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
