Nb-60 at % Ti合金のJc-T-H特性
1973 年 8 巻 4 号 p. 154-161
詳細
1973 年 8 巻 4 号 p. 154-161
In order to mvestigate the mechanisms determing critical current densities in practically used superconducting alloys, Jc-T-H characteristics of Nb-60 at % Ti alloy were measured. Specimens were prepared as the copper clad wires of 0.25mm in diameter, and were aged for various times at 350°C-400°C. The results of measurments on heat-treated specimens show that the precipitates on dislocation network are important as the pinning centers, and the temperature and the field dependence of critical current densities are established in early stage of annealing. The scaling rules for the pinning force densities assume the form Fp∝Hc2(T)n(B/Hc2)p(1-B/Hc2)q, where n≅5/2, p_??_1, and q≅2 for annealed specimens.
