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The powder-in-tube method was successfully employed in improving the critical current densities in rolled multifilamentary Bi-2223 high temperature superconducting composite conductors. Oxide critical current densities of 55 kA/cm2 and critical currents of 125 A were observed in several rolled multifilamentary composites at self field and 77 K. Results show that the self field critical current density may be used to control the the critical current retention in magnetic fields.

The fabrication and characterization of silver-clad TlBa2Ca2Cu3O(8+x) (Tl-1223) films is presented. It details the procedures performed to synthesize superconductors from thalliated precursor powders. It also presents the measurements of transport and magnetization critical current densities which reveal its suitability for high-field and high-temperature applications.

Abstract: The microstructure of AL-6XN, a commercial super-austenitic stainless steel, was investigated using novel two- and three-dimensional (3D) analysis and characterization techniques. The austenite matrix, the second-phase σ precipitates, and the relationships between them have been analyzed, with particular emphasis on the true 3D microstructure of the material, including grain boundary character, grain morphologies and connectivity. A combination of serial sectioning with electron backscatter diffraction (EBSD) analysis allowed for reconstruction of individual grains, and definition of all five degrees of freedom of the grain boundary planes. Second-phase σ particle size and morphology, crystallography, composition, potential formation mechanisms, orientation relationships, and coherency with the matrix have been analyzed. These results provide boundary conditions for atomistic calculations of specific grain boundary structures as well as the basis for mesoscale image-based models of mechanical behavior of the microstructures. [Copyright &y& Elsevier]