The distribution of tensile strength of Nb3Sn in multifilamentary composite wires heat-treated at 973 K for 8.64 ks (sample A) and for 43.2 ks (sample B) was estimated from an analysis of the change in the superconducting critical current at 4.2 K caused by the preloading treatment at room temperature. The average strengths of Nb3Sn in samples A and B for a gauge length of 25 mm were 1.3 and 1.0 GPa, respectively. Applying the two-parameter Weibull distribution function, the shape parameters of samples A and B were 7.2 and 12 and the scale parameters 1.4 and 1.1 GPa, respectively. These results indicate that when the thickness of Nb3Sn becomes great, the average strength becomes low, while the scatter of the strength (the coefficient of variation) becomes small.
- strength distribution
- superconducting critical current
ASJC Scopus subject areas
- Materials Science(all)
- Physics and Astronomy(all)