It was demonstrated that nanocrystalline MgB₂ samples obtained by mechanical alloying show improved superconducting properties. Monofilamentary and
19 filamentary tapes with Fe sheath have been prepared by the powder-in-tube (PIT) method using mechanically alloyed precursor powders consisting of the constituents Mg, B, and MgB₂. With this precursor the tapes can be annealed at relatively low temperatures of 500...600C. For the 19 filamentary tape Jc values up to 35 kA/cm² and 9 kA/cm² in fields of 7.5 T and 10 T, respectively, were measured at 4.2 K. Investigation of the microstructure by optical microscopy, SEM/WDX and XRD have shown that the high Jc values may be mainly due to the remarkably small grain size of the MgB₂ phase and defects particularly precipitates of magnesium oxide. The properties of tapes with iron sheath are compared to those with Cu-sheath.

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