Abstract
Abstract The electro-mechanical characteristics of the nickel sheathed powder-in-tube MgB 2 mono-core tapes with 10 vol% indium powder were evaluated. No marked change in the stress–strain curve was found by indium addition. On the other hand, the irreversible strain for the tape where a drastic degradation of critical current I c begins increased from 0.25% to 0.50% by the addition of indium. The indium addition also suppressed the slight increase in I c with strain. These characteristics of I c with strain were compared with those reported by other researchers. Scanning electron microscope observations of the longitudinal section of degraded samples revealed that the number of micro-cracks was appreciably smaller in the indium added tapes.
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