Characterizations of A15 phase composition and Tc for Internal-Sn Nb3Sn strands

Zhang Chaowu, Andre Sulpice, Zhou Lian, Jean Loius Soubeyroux, Tang Xiande, Christophe Verwaerde, Gia Ky Hoang

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摘要

Four sets of monoelementary (ME) and two kinds of multifilamentary (MF) internal-Sn Nb3Sn superconducting strands were designed and fabricated, in which various component ratios, different composite configurations, and some third-element additions were arranged. All strands were submitted to a first heat treatment (HT) of 210°C/50 h + 340°C/25 h for CuSn mixing, followed by the A15 phase formation HT. The four ME strands were reacted at 675 °C, 700 °C, and 725 °C for 100 and 200 h, respectively, and the two MF strands at 650 °C, 675 °C, 700 °C, and 725 °C for 128 and 200 h, respectively. The analysis of the reacted strands comprised the A15 phase composition distribution by means of X-ray energy-dispersive spectroscopy and the critical temperature Tc by means of superconducting quantum interference device magnetization measurements. The obtained results indicate that, for sufficiently reacted internal-Sn Nb3Sn strands, the final A15 phase composition and Tc are determined by the diffusion and solid reaction mechanism of the A15 phase formation. In particular, the onset Tc values and the average Sn content in a grain do not depend on the reaction temperature, the local compositions in the strand, the composite configuration arrangement, and the third-element addition.

源语言英语
文章编号5570946
页(从-至)2341-2346
页数6
期刊IEEE Transactions on Applied Superconductivity
20
5
DOI
出版状态已出版 - 10月 2010
已对外发布

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