Effect of Joule heating current on phase formation and superconducting properties based on Nb3Al for applications in nuclear fusion magnet energy

Abstract With extremely high critical current density ( J c ) and excellent strain tolerance, Nb 3 Al superconductor is considered as an alternative to Nb 3 Sn for application of high-field magnets. However, owing to their complex structure, Nb 3 Al superconducting wires can hardly meet the requirement of engineering application at present. In this work, we have reported the manufacture of a single core-structured jelly-roll Nb 3 Al precursor long wire. While using homemade rapid heating and quenching (RHQ) equipment, we have successfully carried out RHQ heat-treatment of Nb 3 Al wire samples with various heating conditions, especially the effect of the Joule heating currents by rapid heating, quenching and transformation (RHQT) method on the phase formation and the superconducting properties of the wires were investigated.