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Title of Journal: Sci China Technol Sci

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Abbravation: Science China Technological Sciences

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SP Science China Press

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DOI

10.1002/aoc.432

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1862-281X

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Representation of A15 composition and Emphasis Ty

Authors: ChaoWu Zhang Lian Zhou Andre Sulpice JeanLouis Soubeyroux XianDe Tang Christophe Verwaerde Gia Ky Hoang
Publish Date: 2010/10/17
Volume: 53, Issue: 11, Pages: 3020-3026
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Abstract

Four sets of monoelement ME and two kinds of multifilament MF internalSn Nb3Sn superconducting strands were designed and fabricated through RRP method in which different compoment ratios various composite configurations and some third element alloying were arranged All the strand samples underwent a 210°C/50 h + 340°C/25 h thermal duration for CuSn alloying After that A15 phase formation heat treatment HT was applied for which the ME samples were chosen at three reaction temperatures of 675°C 700°C and 725°C for 100 h and 200 h while the MF samples at four temperatures of 650°C 675°C 700°C and 725°C for 128 h and 200 h The heattreated samples were examined for A15 phase composition distribution by Xray EDS SQUID magnetization measurement was used to determine critical temperature T C The obtained results demonstrate that for fullyreacted internalSn Nb3Sn superconductors the A15 phase composition and the intrinsic property T C are determined by the diffusion and solid state reaction mechanism and are independent of the factors including HT temperature strand composite component and configuration arrangement and the third element addition within the experimental range

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