Effect of Post-Heat Treatment on the Critical Current Density of Nb3Al Superconductor
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The achievement of stoichiometry is very important for Nb3Al superconductor with excellent properties. A rapid heating, quenching, and transformation method is efficient to achieve stoichiometric Nb3Al superconducting wires, and supersaturated solid solution phase was transformed to Nb3Al in the transformation process with a post-annealing temperature between 800° to 900 °C and for 10 h. X-ray diffraction analysis revealed that the Nb3Al wires were of pure Nb3Al phase with a superconducting transition temperature about 18 K. Experimental results further showed that superconducting transition width was narrowed by quenching process after post-annealing. For the typical samples, the H c2(T) was determined from the onset transitions of the M–Tcurves under various applied fields and the H c2(0) value was extrapolated to be about 35 T. A significantly high J c value under a magnetic field up to 9 T and at 8 K was observed. The pinning behavior of the Nb3Al wires was also discussed.
KeywordsNb3Al Post-heat treatment Critical current densities
This work was supported by National Magnetic Confinement Fusion Science Program (Grant No. 2011GB112001), Program of International S&T Cooperation (Grant No. 2013DFA51050), and the National Natural Science Foundation of China (Grant No. 51271155, 51377138).
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