Influence of Al Composition Thickness on Critical Current Density in Transformation-Processed $\hbox{Nb}_{3}\hbox{Al}$ Superconductors
Influence of Al Composition Thickness on Critical Current Density in Transformation-Processed $\hbox{Nb}_{3}\hbox{Al}$ Superconductors
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DOI：
10.1109/tasc.2014.2359547
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发表时间：
2015-06
影响因子：
1.8
通讯作者：
N. Banno;K. Tsuchiya;T. Nakamoto;A. Kikuchi;T. Takeuchi;Y. Iijima;K. Tomita;S. Kato;K. Suzuki;T. Takao;K. Nakagawa
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文献类型：
--
作者：
N. Banno;K. Tsuchiya;T. Nakamoto;A. Kikuchi;T. Takeuchi;Y. Iijima;K. Tomita;S. Kato;K. Suzuki;T. Takao;K. Nakagawa
研究了Al层厚度对相变Nb_3Al超导体临界电流密度Jc的影响。前体线材的粗轧细丝中的Al层厚度从120 nm变化到250 nm; Nb层厚度与Al厚度成比例，保持Nb-Al组成比为3。快速加热和淬火（RHQ）操作条件在形成韧性体心立方（BCC）Nb-Al相的条件范围内变化。在Nb 3Al相转变之前，RHQ线还遵循面积还原过程。较薄的Al厚度的丝显示出Jc随着面积的减小而急剧增加，而较厚的Al厚度的丝显示出较慢的增加。对于最薄的Al厚度样品，获得了最佳的Jc性能。在没有面积减少的情况下，最佳Jc相对于Al厚度没有太大的差异。
The influence of the Al layer thickness on the critical current density Jc of transformation-processed Nb3Al superconductors was investigated. The Al layer thickness in the jerry-roll filaments of precursor wires was varied from 120 to 250 nm; the Nb layer thickness is proportional to the Al thickness, keeping the Nb-Al composition ratio to 3. The rapid heating and quenching (RHQ) operation condition was varied within a range of the conditions to form the ductile body-centered cubic (BCC) Nb-Al phase. The RHQ wires were also followed by an areal reduction process prior to the Nb3Al phase transformation. Thinner Al thickness wires show a steeper increase in Jc with reduction in the area, whereas thicker Al thickness wires show a slower increase. The best Jc performance was obtained for the thinnest Al thickness sample. Without areal reduction, there was not much difference in the optimum Jc with respect to the Al thickness.