Abstract
Techniques of optical metallography, x-ray diffraction, scanning and transmission electron microscopy, and scanning acoustic tomography (microscopy) are used to examine shock-induced microstructures and microcracks in explosively fabricated YBa 2Cu 3O 7 and Bi 7Pb 3Sr 10Ca 10Cu 15O x superconductors. These microstructural features are related to residual degradation of superconductivity as evidenced by alterations in the resistance-temperature (R-T) signatures. Silver additions to YBaCuO superconducting powder is observed to reduce the residual degradation after shock wave loading, and similar manipulations of the R-T signatures are also observed for explosively fabricated and annealed YBaCuO and BiPbSrCaCuO. Transport supercurrent measured as transport critical current density ( J c ) is also observed to depend upon peak shock pressure. The observations suggest that, by manipulating the microstructure prior to shock loading (e.g., by silver additions), the peak shock pressure, and the annealing kinetics following shock loading, it may be possible to develop novel, bulk, superconducting devices by explosive fabrication in composite metal matrices.
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