Heat treatments, microstructure and properties of internal-tin Nb/sub 3/Sn

Heat treatments, microstructure and properties of internal-tin Nb/sub 3/Sn

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 ra...

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Veröffentlicht in:IEEE transactions on applied superconductivity 1997-06, Vol.7 (2), p.1504-1507
Hauptverfasser: Taillard, R., Verwaerde, C., Bruzek, C.E., Sulten, P.
Format: Artikel
Sprache:eng
Schlagworte:
Critical current density
Heat treatment
Heating
Magnetic fields
Magnetic properties
Microstructure
Niobium
Phase change materials
Temperature
Tin
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Zusammenfassung: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.
ISSN:1051-8223
1558-2515
DOI:10.1109/77.620858