DEFORMATION-DOMINATED TEXTURING OF SUPERCONDUCTING FILAMENT IN OPIT-FABRICATED BI(PB)SCCO-2223 AG COMPOSITE TAPES/

Texture formation in the ceramic filament of Ag/BiSCCO tapes was studi ed after cold rolling, uniaxial cold pressing and sintering by XRD --2 - and omega-scan methods, More effective texturing of the outer layers as compared to that of the core interior was observed at the early ro lling steps up to about 65% reduction in area, Texture inhomogeneity o ver the filament cross section is related to the inhomogeneous distrib ution of plastic deformation, Work hardening due to plastic deformatio n of non-sintered powder results in the broadening of X-ray peaks and an increase in microhardness. The recovery of these parameters occurs after annealing at the temperatures of 350-600 degrees C. The omega-sc an studies revealed an improvement of c-asis texture by intermediate r olling compared to that in the omega-sintered and pressed states, Defo rmation-induced texturing of the 2212-precursor is the main factor res ponsible for the texture of the final 2223-phase, The influence of Ag during the sintering stage is limited only to the outer levers of the filament; in the case of low preliminary deformation internal layers r emained practically non-oriented.