Effect of Post-Heat Treatment on the Critical Current Density of Nb3Al Superconductor
Effect of Post-Heat Treatment on the Critical Current Density of Nb3Al Superconductor
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DOI：
10.1007/s10948-015-2960-6
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发表时间：
2015-02
影响因子：
1.8
通讯作者：
Pingyuan Li;Xiao-lan Zhang;Da-wei Yang;Suhua Yang;X. Pan;G. Yan;Yong Zhang;Yong Feng;Yong Zhao
中科院分区：
文献类型：
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作者：
Pingyuan Li;Xiao-lan Zhang;Da-wei Yang;Suhua Yang;X. Pan;G. Yan;Yong Zhang;Yong Feng;Yong Zhao
化学计量学的取得对于具有优异性能的Nb3Al超导体是非常重要的。采用快速加热、淬火和相变的方法可以有效地获得化学量的Nb3Al超导丝，在800°~ 900°C退火10 h的过程中，过饱和固溶体相变为Nb3Al。x射线衍射分析表明，Nb3Al超导丝为纯Nb3Al相，超导转变温度约为18 K。实验结果进一步表明，后退火后的淬火工艺可缩小超导转变宽度。对于典型样品，hc2 (T)由em - T曲线在不同磁场下的起始跃迁确定，并推断出hc2(0)值约为35 T，在高达9 T和8 K的磁场下观察到显著的高jcvalue。讨论了Nb3Al丝的钉住行为。
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, theHc2(T) was determined from the onset transitions of theM–Tcurves under various applied fields and theHc2(0) value was extrapolated to be about 35 T. A significantly highJcvalue under a magnetic field up to 9 T and at 8 K was observed. The pinning behavior of the Nb3Al wires was also discussed.