Figure 2 | Scientific Reports

Figure 2

From: Precipitous change of the irreversible strain limit with heat-treatment temperature in Nb3Sn wires made by the restacked-rod process

Figure 2

Critical-current relative degradation, defined as the Ic drop for an unloaded strain point relative to the loaded strain point at the same applied strain [for example points W′ and R in Fig. 1(a)]. Data were obtained at 4.04 K and 15 T for samples of an RRP Ti-doped Nb3Sn wire (billet 11976-1), heat-treated for 48 hours at 640 °C and 664 °C. The rate of Ic degradation beyond εirr,0 (=εirr − εmax) is about three times larger for 640 °C, for the specific protocol used in these measurements (described in Fig. 1 caption). Results are shown for two samples per heat-treatment temperature; for three segments (≈8 cm long each) per sample. Same color was used for symbols depicting data of a given sample, and each symbol of a given color represents one sample segment.

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