The 2G coated conductor (CC) tapes exhibit greater potential in magnet and coil applications because of their high critical current density, Jc and good mechanical properties along longitudinal direction. Differences in fabrication processes, architecture, and layer materials in REBCO CC tapes produce different mechanical and electromechanical behaviors under magnetic field B, temperature T, and with applied strain ε. For practical applications of HTS CC tapes to magnets, the understanding of critical current, Ic behavior under B, T, and ε is necessary. In this paper, the Ic (ε) characteristics of brass foil laminated RCE-DR processed GdBCO CC tapes under various temperature and magnetic field conditions have been examined. As results, it showed that the brass laminated CC tapes showed no significant difference as compared to Cu-stabilized CC tapes in magnetic field dependence of Ic at various low temperatures. The εirr. of brass laminated CC tape increased with decreasing temperature from 77 K down to 20 K, and showed some increased values when compared with the cases of Cu-stabilized ones. This behavior was resulted of thermal hardening effect of brass foils to the CC tapes decreasing temperature that caused some increase in its yield strength. Finally, the strain sensitivity and magnetic field dependence of Ic in brass-laminated CC tapes decreased with decreasing temperature from 77 up to 20 K, resultantly increasing the εirr.value.
* This work was supported by a grant from the Power Generation & Electricity Delivery Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by the Ministry of Trade, Industry and Energy, Republic of Korea (No. 20131010501800). This work was also partially supported by a grant from National Research Foundation of Korea under Grant NRF-2014-002640.This work was also carried out as an activity of Collaborative Research (No. 16H0051) of HFLSM, IMR, Tohoku University, Japan.