超電導Nb-40at%Zr-10at%Ti線における応用効果(I)縦方向磁化特性

概要

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Magnetization and tensile stress - strain characteristics of superconducting Nb-40at% Zr-10at% Ti wires were measured in a magnetic field in the direction of wire axis. It was found that the observed values of both the tensile strength and Young's modulus for copperclad wires agreed fairly well with the low of mixtures. For bare wires in the presence of a tensile stress, the occurrence of flux jumps was indicated by measuring the magnetization, where the jumpfield H/j was depening on the value of the applied stress. No flux jump, however, was detected at a certain stress level, i.e. 1.38 x 10^Nm^<-2> for the bare sample. This effect can be attributed to the fact that the internal compressive stress originating from the cooling was just released to the stress - compensated state by that value of external tensile stress. The magnitude of this stress is the same order as in the stress - compensated state of the multifilamentary Nb3Sn or V_3Ga samples, but the strain is rather small, i.e. 〜2.5x10^<-4>, comparing with that of compound wires, i.e. 〜8x10^<-3>. This also suggests that even a small strain exerts a strong influence on flux jumps for bare wires.
近畿大学の論文
1980-12-01