TY - JOUR
T1 - Strain characteristics of Nb3Sn multifilamentary wires with CuNb reinforcing stabilizer
AU - Katagiri, K.
AU - Watanabe, K.
AU - Noto, K.
AU - Goto, K.
AU - Saito, T.
AU - Kono, O.
AU - Iwamoto, A.
AU - Nunogaki, M.
AU - Okada, T.
N1 - Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 1994/12
Y1 - 1994/12
N2 - Bronze processed multifilamentary Nb3Sn superconducting wires, with a CuNb reinforcing stabilizer instead of the conventional Cu stabilizer, were fabricated. The mechanical properties and the strain dependence of the critical current Ic were evaluated at 4.2 K and a magnetic field of 15 T. A remarkable increase in the yield stress (70%) and the plastic flow stress as compared to the values for the wire with Cu stabilizer was observed. The strain for the peak Ic was also increased by 0.2%. Ic on unloading was reversible within the strain range of 1.5%. The strain sensitivity of Ic in the CuNb/Nb3Sn wire was almost the same as that of the Cu/Nb3Sn wire. A decrease in the wire diameter from 0.8 to 0.5 mm resulted in a slight increase in the yield stress of the CuNb/Nb3Sn wire, but no change in the strain dependence of Ic. An increase in the heat treatment temperature from 700 to 750°C resulted in a decrease in the flow stress of 15%, but no change in the strain dependence of Ic. A marked change in the morphology of the Nb filament in the CuNb reinforcing stabilizer was evidenced during heat treatment.
AB - Bronze processed multifilamentary Nb3Sn superconducting wires, with a CuNb reinforcing stabilizer instead of the conventional Cu stabilizer, were fabricated. The mechanical properties and the strain dependence of the critical current Ic were evaluated at 4.2 K and a magnetic field of 15 T. A remarkable increase in the yield stress (70%) and the plastic flow stress as compared to the values for the wire with Cu stabilizer was observed. The strain for the peak Ic was also increased by 0.2%. Ic on unloading was reversible within the strain range of 1.5%. The strain sensitivity of Ic in the CuNb/Nb3Sn wire was almost the same as that of the Cu/Nb3Sn wire. A decrease in the wire diameter from 0.8 to 0.5 mm resulted in a slight increase in the yield stress of the CuNb/Nb3Sn wire, but no change in the strain dependence of Ic. An increase in the heat treatment temperature from 700 to 750°C resulted in a decrease in the flow stress of 15%, but no change in the strain dependence of Ic. A marked change in the morphology of the Nb filament in the CuNb reinforcing stabilizer was evidenced during heat treatment.
KW - CuNb alloy
KW - reinforcing stabilizer
KW - strain characteristics
KW - superconducting wires
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U2 - 10.1016/0011-2275(94)90099-X
DO - 10.1016/0011-2275(94)90099-X
M3 - Article
AN - SCOPUS:0028726006
VL - 34
SP - 1039
EP - 1043
JO - Cryogenics
JF - Cryogenics
SN - 0011-2275
IS - 12
ER -