Abstract
Fine-filamentary MgB2/Ti/GlidCop wire has been produced by an in situ process. Hydrostatic extrusion, drawingand two-axis rolling were used for wire deformation up to the size of0.2 × 0.2 mm2. An averagedfilament size of 7.6–14 µm was obtained for two-axis rolled wire and tape, which are the smallestMgB2 filaments known so far. Very short annealing periods (3–7 min) wereused for the thinnest filaments, resulting in a critical current density of≈12 000 A cm − 2 at 8 T and 4.2 K. The results presented demonstrate the ability to prepare uniform≈10 µm size and high currentdensity filamentary MgB2 wires in nonmagnetic sheaths, which can be applied for DC and AC coils.
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