Mechanical properties of i n s i t u multifilamentary Nb3Sn superconducting wires

Abstract

The mechanical properties of in situ Cu–36 wt% Nb–x wt% Sn superconducting wires are presented where 5<xx, no degradation of critical current J_c is observed for stresses σ up to 700 MPa (∼100 ksi) and a maximum J_c occurs at σ≃450 MPa. Strains of ∼0.6–0.9% are measured at 300 and 77 K for 450 MPa, and ∼1.5–2% for 700 MPa. Cyclic stress data are consistent with a prestress model for composite materials.