Effect of Heat Treatment on the Superconducting Properties of Nb—Ti Alloys
The effects of annealing time and temperature on the structure and superconducting characteristics (critical current and superconducting transtormation temperature) of Nb-Ti alloys are studied individually. Heat treatment raises the critical current density of cold-worked alloys. The maximum critical current density is achieved in a Nb-75%Ti alloy (105 A/cm2 in a field of 26 kOe) after annealing at 450° (for 1 h in final annealing or 10 h after intermediate annealing). The transtormation temperature rises to 8.6°K in the annealed alloys. The effect of heat treatment on the superconducting characteristics is associated with the decomposition of the original β solid solution of the cold-worked Nb-Ti alloys.
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