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

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4 Author(s)
Taillard, R. ; Lab. de Metall. Phys., Lille I Univ., Villeneuve d'Ascq, France ; Verwaerde, C. ; Bruzek, C.E. ; Sulten, P.

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.

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Applied Superconductivity, IEEE Transactions on  (Volume:7 ,  Issue: 2 )