Title :
Nb3Al wire produced by powder metallurgy and rapid quenching from high temperatures
Author :
Thieme, C.L.H. ; Pourrahimi, S. ; Foner, S.
Author_Institution :
MIT, Cambridge, MA, USA
fDate :
3/1/1989 12:00:00 AM
Abstract :
Powder-metallurgy-processed Nb-25-at.% Al wires were annealed at temperatures just below the melting temperature. Depending on anneal conditions, the entire Nb-Al part of the wire could be rapidly quenched as a metastable Al Nb(Al) solid solution with an Al concentration exceeding 23 at.%. This A2 phase is sufficiently ductile to be bent without incurring damage. A second anneal at 950°C converted the A2 into A15. Jc was 104 A/cm2 at 22 T, and Tc was 17.8 K. The rapid quenching of Nb-Al powder metallurgy processed wire is a possible alternative to obtain improved high-field properties
Keywords :
aluminium alloys; annealing; critical current density (superconductivity); ductility; niobium alloys; powder metallurgy; quenching (thermal); superconducting transition temperature; type II superconductors; 17.8 K; 950 degC; A15 phase; A2 phase; Al concentration; Nb3Al wire; anneal conditions; bending; ductility; improved high-field properties; metastable solid solution; powder metallurgy; rapid quenching; superconducting critical current density; transition temperature; Annealing; Billets; Copper; Heat treatment; Niobium; Powders; Production; Swaging; Temperature; Wire;
Journal_Title :
Magnetics, IEEE Transactions on
