Abstract
The superconducting transition behavior of Zr-Nb binary alloys has been investigated in conjunction with studies of the alloy constitution and microstructure. The superconducting transition temperature ( T c ) is reduced by the formation of the omega phase during aging and is raised by a subsequent omega reversion treatment. Isothermal aging at 550 °C for 175 h increases the value of T c from 6.82 K in the as-quenched condition to 10.2 K. The temperature range characterizing the superconducting transition is broadened by the presence of composition fluctuations in the beta phase. The formation of the aged omega phase at 350 °C is inhibited by repeated aging and reversion treatments.
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