Abstract
Normal rolling, “sandwich” rolling, pressing, hot-pressing, and cryogenic pressing were used as the intermediate mechanical deformation for making Ag-clad Bi-based superconducting tapes. Magneto-optical imaging results were taken to study the density of the microcracks and the distribution of the microcracks. J c of sandwich rolled tape is 35% higher than the normal rolled tape. J c and relative density of the tapes with three different processes (normal rolling, “sandwich” rolling, and pressing) are increased when increasing the reduction rate, then reached a peak at optimal reduction rate and decreased at large reduction rate.
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