Material issues in the 100 T non-destructive magnet

The effort in materials program related to the first 100 T non-destructive (100 T ND) magnet has been concentrated on four areas: a.) development of t he fabrication routes for various conductive wires in collaboration with ot her institutes and industrial partners, b.) investigation of the properties of a variety of candidate high strength high conductivity materials, c.) s election of the reinforcement materials for the coils and development of fa brication routes for these materials, d.) characterization of the commercia lly available insulation materials. This paper deals with the conductor iss ues. The properties and the microstructure of Cu-Ag, UNS-C157XX (Cu-Al2O3), Cu+Stainless Steels (SS) and Cu-Nb composites have been investigated for t heir potential use as conductors in pulsed high field magnets, These conduc tors demonstrate a combination of good conductivity, high strength, adequat e workability, and the availability of final section sizes needed for the m agnet design. Examination of the initial portion of the stress strain curve of cold worked conductors reveals that the internal stresses developed dur ing the fabrication influence the mechanical response of the materials. Thu s, the properties of the drawn materials have been measured as a function o f cyclic loading and thermal annealing cycles, and the cyclic properties ar e related to the internal stresses.