A review of mechanical behaviour and stress effects in hard superconductors

摘要: Abstract The mechanical properties of type II superconducting materials are reviewed as well the effect stress on these materials. bcc alloys Nb-Ti and Nb-Zr exhibit good strength extensive ductility at room temperature. Mechanical tests 4.2 K revealed serrated stress-strain curves, non-linear elastic effects, reduced ductility. behaviour is probably due to twinning de-twinning or a reversible stress-induced martensitic transformation. brittle A-15 compound superconductors, such Nb 3 Sn V Ga, unusual structural instabilities cryogenic temperatures. p]Multifilamentary composites consisting filaments in normal metal matrix normally used for devices. alloy composites, tapes, niobium carbonitride chemically vapour deposited high carbon fibres presented. Hysteretic produces significant heat generation, an which may lead degradation performance field magnets. Measurements critical current density, J c , under magnetic reported. Modest stress-reversible observed while more serious found sample. importance device discussed.