TY - JOUR
T1 - Effect of heat treatment on critical current density in multifilamentary Nb46.5Ti/Cu composites at high magnetic fields
AU - Liu, X. H.
AU - Zhou, L.
AU - Wu, X. Z.
AU - Zhou, N.
AU - Zhang, P. X.
AU - Feng, Y.
PY - 2000/7/1
Y1 - 2000/7/1
N2 - A lower temperature pre-heat treatment process was used to study the effects of heat treatment on microstructure and critical current densities in Nb46.5Ti multifilamentary composites. The results show that pre-heat treatment at lower temperature (such as 375°C) is beneficial to refining α-Ti particles and sub-bands, furthermore dispersing α-Ti particles throughout NbTi matrix, and then, critical current densities have been obviously improved at higher magnetic fields. At 4.2 K, 5 T, critical current densities reached 3500 A/mm2, and at 4.2 K, 8 T, it reached 1740 A/mm2 for the first time. On the other hand, α-Ti particles are larger and not dispersed in Nb46.5Ti superconductors for pre-heat treated at higher temperature, and the Jc is lower, especially at low final strain. It is believed that refining the dispersed α-Ti precipitates and improving the amounts are the main reasons for improving critical current densities in Nb46.5Ti/Cu composites at higher magnetic fields.
AB - A lower temperature pre-heat treatment process was used to study the effects of heat treatment on microstructure and critical current densities in Nb46.5Ti multifilamentary composites. The results show that pre-heat treatment at lower temperature (such as 375°C) is beneficial to refining α-Ti particles and sub-bands, furthermore dispersing α-Ti particles throughout NbTi matrix, and then, critical current densities have been obviously improved at higher magnetic fields. At 4.2 K, 5 T, critical current densities reached 3500 A/mm2, and at 4.2 K, 8 T, it reached 1740 A/mm2 for the first time. On the other hand, α-Ti particles are larger and not dispersed in Nb46.5Ti superconductors for pre-heat treated at higher temperature, and the Jc is lower, especially at low final strain. It is believed that refining the dispersed α-Ti precipitates and improving the amounts are the main reasons for improving critical current densities in Nb46.5Ti/Cu composites at higher magnetic fields.
UR - http://www.scopus.com/inward/record.url?scp=0034229445&partnerID=8YFLogxK
U2 - 10.1016/S0921-4534(00)00104-0
DO - 10.1016/S0921-4534(00)00104-0
M3 - 会议文章
AN - SCOPUS:0034229445
SN - 0921-4534
VL - 337
SP - 217
EP - 220
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 1
T2 - IUMRS-ICAM'99: Symposium B of the 5th International Conference on Advanced Materials 'High-Tc Superconductors'
Y2 - 13 June 1999 through 18 June 1999
ER -