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Iron-based superconductors have been considered to be very promising inhigh-field applications, for which multifilamentary wire and tape conductorswith high mechanical strength are essential. In this work, 7-,19- and114-filament Sr0.6K0.4Fe2As2 (Sr-122) superconducting wires and tapes withsilver as matrix and iron as outer reinforcing sheath were produced by the exsitu powder-in-tube method. The mass densities of Sr-122 phase in 7- and19-filament conductors were investigated by microhardness characterization,which revealed a positive correlation between hardness and transport criticalcurrent density (Jc) in round wires and flat tapes with various thicknesses.For Sr-122/Ag/Fe 114-filament conductors, in which an average cross-sectionalfilament size smaller than 50 microns was achieved by drawing into round wiresof 2.0 mm in diameter, the transport Jc can be significantly enhanced by flatrolling, as for the 7- and 19-filament conductors. The highest transport Jc ofthe 7-,19- and 114-filament Sr-122/Ag/Fe tapes reached 1.4x10^4, 8.4x10^3 and6.3x10^3 A cm-2 (4.2 K, 10 T), respectively, showing a Jc degradation with theincrease of filament number. This Jc degradation can be ascribed to the sausageeffect for filaments in longitudinal direction and the grain refinement inthese very fine filaments.

Critical current density and microstructure of iron sheathed multifilamentary Sr1-xKxFe2As2/Ag composite conductors