Abstract
Large bars were melt-textured using a modified Bridgman method. Neutron diffraction analysis revealed the absence of any large angle grain boundary and a FWHM of < 6 °. Smaller specimens cut from the bars were deformed under flowing oxygen in the temperature range 850–950 °C applying strain rates from 1 × 10 −5 to 5 × 10 −4 s −1. These high temperature deformation experiments reveal that the predominant deformation mechanism is dislocation glide and climb controlled by climb at Y-211 particles and that no significant grain boundary sliding occurs. TEM investigations support a deformation mechanism based on dislocation movement, i.e. the dislocation density of the deformed samples is 2–3 orders of magnitude larger ( n d > 10 9 cm −2) than that of undeformed samples. Critical current density measurements clearly follow the induced microstructural changes. An improvement of the mechanical properties is expected by introducing a bimodal Y-211 distribution.
Published Version
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