Critical Current Density of Bronze-Processed Multifilamentary Nb sub 3 SN Wires with Magnesium Addition to the Matrix

摘要

The effects of the addition of magnesium to the bronze of a bronze-processed multifilamentary Nb sub 3 Sn conductor were studied. The bronze composition was varied from Cu-6.7Sn-0.0Mg to Cu-6.7Sn-0.62Mg. The magnesium was found to refine the Nb sub 3 Sn grain size and improve the critical current density of the superconductor. The most heavily doped wire had an optimum critical current density three to six times better than the Mg-free control wire at all fields. (ERA citation 09:035973)