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X-ray diffraction studies of the relationship between defect structure and superconducting properties in niobium-titanium alloys

The results of an X-ray line-broadening investigation of the effects of progressive deformation by rolling on two niobium-titanium alloys are reported and compared with similar measurements made on filed powders. The critical-current-critical-field superconducting properties of the same alloys are also reported as a function of deformation and heat treatment. Correlation of the X-ray diffraction and superconducting results suggests that some improvement in superconducting properties after low-temperature post-deformation heat treatment can be associated with the initiation of a recovery process in the deformed alloy. The peak effect is observed in one of the alloys investigated.