Abstract
Control of precursor density during the deformation process of Bi,Pb(2223) tapes is crucial in order to achieve a good homogeneity of the filaments. When an excessive density is reached too early, the ceramic grains cannot longer slide properly, which results in an more pronounced sausaging. Two-axes rolling is known to yield a higher homogeneity among the filaments. On the other hand, the ceramic density increases much faster than during conventional deformation processes. Therefore, we used the combination of two-axis rolling and longitudinal stress. We present density, texture and transport measurements both during the deformation process and after the heat treatment. Results clearly show an improvement in the control of microstructure resulting in higher critical current densities in tapes deformed under longitudinal stress compared to tapes deformed without stress.
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