Abstract
A15 Nb 3AI tape superconductors have been prepared by high power and continuous wave CO 2 laser irradiation onto moving NbAl composite tapes made by the powder method. The irradiated area was melted and then immediately resolidified, which resulted in a dendritic microstructure consisting of Nb dendrites embedded in a Nb 3AI matrix. Irradiated only specimens showed critical temperatures, T c, >16.0 K and subsequent heat treatment at 750°C enhanced T c to 18.6 K. For laser irradiated and then heat treated specimens, critical currents, I c, were little decreased, even at >20 T, compared with specimens which were only heat treated. A maximum critical current density, J c, for the reacted area of 4.8 × 10 4 A cm −2 was obtained at 23 T and 4.2 K.
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