Abstract
The results of the staged critical current and structure determination are given for HT-50 and HT-55 superconductor wire specimens subjected to four intermediate anneals at 400°C. After the first anneal, Jc of both the alloys grows by more than an order of magnitude which is related to an intergranular and, in the case of HT-55 alloy, also an intragranular α-phase precipitation. Subsequent deformation cycles of thermomechanical working (TMW) effect an increaseof Jc, a decrease of α-phase and β-matrix subgrain sizes, while intermediate anneals have an opposite effect. An increase of Jc is observed at the final stage of drawing. The specimens of HT-50 and HT-55 alloys have, respectively, Jc = 3.2×105 A/cm2 and 3.9×10 A/cm5 A/cm2 in a field of 5T. The value is shown to depend on the size of β-matrix subgrains, the boundaries of which are decorated with α-particles.
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G. K. Zeleskiy, V. A. Vasi’liev, L. D. Bogdanova, E. V. Nikulenkov, A. P. Golub’, “HT-50 composite superconductors fo UNK magnets,” Report at the 24 International conference of countries-members of CMA on Physics and Techniques of Low Temperatures, 17–20.09, Berlin, DDR (1985).
G. Gregory, Recent advances in commercial multifilamentary Nb-Ti wires in the United states, in: “Cryogenic Materials, 88,” vol. 1, Superconductors, R. P. Reed, Z. S. Xing, E. W. Collings, eds., ICMC, Boulder, Colorado (1988), pp. 361–371.
Li Chengren, Wu Xiao-Zu, and Zhon Nong, NbTi Superconducting composite with high critical current density, in: “IEEE Transactions of Magnetics,” vol. MAG-19 (1983), pp. 284–287.
D. C. Larbalestier, P. J. Lee, Li Chenren, and W. H. Wares, New developments in Nb-Ti superconductors, in: “Proceedings of Workshop on Superconducting Magnets and Cryogenics,” P. G. Dahl, ed., BNL-52006 (1986), p. 45–50.
A. D. McInturff, Metallurgy of the NbTi superconductors, in: “Metallurgy of Superconductor Materials,” T. Luhman, D. Dew-Hughes, eds., Academic Press, New York (1979), pp. 67–96.
G. K. Zelenskiy, A. P. Golub, A. D. Nikulin, V. Ya. Fil’kin, V. P. Kosenko, V. L. Mette, E. V. Nikulenkov, and L. V. Potanina, “Composite Superconductors for UNK magnets,” Report CB-3, ICMC, Boulder, Colorado (1988).
Zhang Tingju, Wu Ziaozu, Li Chengren, and Zhow Nong, The pining force and critical current in Nb-Ti superconducting wire with plate-like Ti precipitates, in: “Advances in Cryogenic Materials,” vol. 32, N 4, (1986), pp. 903–909.
E. W. Collings, The Physical metallurgy of titanium alloys, ASM (1984).
V. Ya. Fil’kin, V. F. Gogulija, V. P. Kosenko, E. V. Nikulenkov, A. D. Nikulin, P. I. Slabodchikov, G. K. Zelenskiy, K. P. Myznikov, A. I. Nikulin, and V. A. Basil’iev, Composite Superconductors for UNK Magnets, in: “Proceedings of Workshop on Superconducting Magnets and Cryogenics,” P. F. Dahl, ed., BNL52006 (1986). pp. 56–59.
V. S. Titov, G. N. Vlasov, Foils preparing method for electro-microscopic in investigation of superconducting wire, in: “Proceedings of the All Union Scientific Research Institute of Electromechanics,” vol. 40, Moscow (1974), pp. 133–136.
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© 1990 Plenum Press, New York
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Zelenskiy, G.K. et al. (1990). Influence of Thermomechanical Working Schedules on Structure and Properties of HT-50 and HT-55 Superconductor Alloys. In: Reed, R.P., Fickett, F.R. (eds) Advances in Cryogenic Engineering Materials . An International Cryogenic Materials Conference Publication, vol 36. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-9880-6_38
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DOI: https://doi.org/10.1007/978-1-4613-9880-6_38
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