A Flexible A-15 Superconducting Tape in the Nb3(Al Si B)1 System
Melt spinning was used to rapidly solidify Nb3(Al Si B) alloys. It was found that without B, a minimum of 18 at% Si was required to form an amorphous ribbon which resulted in a low superconducting transition temperature, Tc, of the annealed A-15 product. By the addition of 0.5 at% B, the necessary Si content was reduced to 12 at%, thus greatly increasing T of the annealed A-15. The annealed metallic glass was far more flexible than the A-15 ribbon obtained by quenching directly into the crystalline state. Total percent bend strain to fracture was increased 30 times from 0.1% to 3%. The flexibility was increased by grain refinement. This is consistent with behavior previously observed by the authors in the Ti3Nb6 Mo3Si6 system.
KeywordsSuperconducting Transition Temperature Amorphous Ribbon Superconducting Tape Total Percent Elongation Large Grained Sample
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