Abstract
Two different filamentary MgB2 wires were subjected to twisting before and also after the final heat treatment(HT). Wires twisted before HT showed only degraded critical currents (Ic) starting from theratio Lt/dw < 30–40, whereLt is the twist pitchand dw is the wirediameter. Increased Ic (by 8.0–20%) were measured for wires twisted after HT at anLt/dw ratio of 38–90 depending on the annealing conditions (temperature/time) and also on wire composition. Reduced irreversible strain (εirr) was also measured for wires twisted after HT. ImprovedIc and decreasedεirr of examinedfilamentary MgB2 wires are explained by the change of residual strain inside the composite wire caused bytorsion stress.
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