Abstract
A multifilamentary Nb/Al precursor is fabricated by the jelly-roll process method. The final diameter without Cu is 0.6 mm. The final Al layer is 200–300 nm in thickness. An apparatus is designed and constructed to perform the rapid heating and quenching (RHQ) treatment for the Nb/Al precursor short samples. After the RHQ treatment, the short samples are heat treated at 800 °C for 10 h. Transport tests and magnetization measurements are performed at temperatures above 8 K to investigate the superconducting properties and microstructure of the samples. The highest onset $T_{C}$ of the samples is 17.7 K by zero-field-cooled magnetization test, which means that near-stoichiometric Nb3Al phase is achieved. Some samples have a second superconducting transition at 12–13 K. Results from transport tests show that samples heated by a voltage of 170–175 V have better current-carrying capacity (125 A/mm2 at 11 K, self-field) and high transition temperature. Further optimization on the RHQ and transformation heat treatment process is still needed to improve the superconducting properties of the samples.
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