Direct observation of Nb 3 Sn lattice deformation by high-energy x-ray diffraction in internal-tin wires subject to mechanical loads at 4.2 K

摘要: With the aim of clarifying relationship between lattice deformations and superconducting properties Nb3Sn technological wires we have carried out high-energy x-ray diffraction experiments at European Synchrotron Radiation Facility (ESRF) in Grenoble on individual samples multi-filamentary internal-tin-type wires. In particular, a test probe developed University Geneva allowed us to perform these 4.2 K, while applying an axial tensile load specimen. this way, parameter values all constituents (Nb3Sn, Nb, Cu) were determined, both parallel orthogonal directions with respect applied axis, as function strain. The performed industrial wires, which reinforced by stainless steel outer tube, before reaction heat treatment, order evaluate effect additional pre-compression relation microscopically determined crystalline measured strain is discussed basis for analysis performances subject mechanical loads.