| Abstract: | The dislocation substructure of melt-textured YBa2Cu3O7-Y2BaCuO5 composites deformed under uniaxial compressive stress and a superposed gaseous confining pressure has been investigated by transmission electron microscopy. Observations reveal the generation of perfect dislocations in (001) as well as out of this plane. Screw segments of the latter lying on (001) are seen to act as Frank-Read sources for ? 〈301〉 partials bounding YBa2Cu4O8-type stacking faults, according to a mechanism previously anticipated from theoretical considerations by one of the present authors. |
