Paper Title:
Reactive Diffusion in Cu-Nb-Sn Internal Tin Superconducting Wires for the ITER Project
  Abstract

The reactive diffusion and phase formation sequences in two types of ‘internal tin’ superconducting wires designed for the ITER project, which investigates the production of electricity by means of nuclear fusion, have been studied during heat treatments both in situ, using electrical resistometry [1] and ex situ, using optical and scanning electron microscopy, energy dispersive X-ray spectrometry (EDS) and X-ray Micro-Tomography (XMT). XMT reveals long pores in the longitudinal direction which may result in tin deficiency thereat and hence local off-stoichiometric Nb3Sn. Microscopy suggests there are incomplete conversion of elemental tin to copper-tin intermetallics before ramping above the tin melting temperature, nonuniform distribution of tin before formation of Nb3Sn, and filament movement and bridging, stacking cracks and unreacted niobium at the end of the heat treatment. FEGSEM shows a fine microstructure which nevertheless could still be improved.

  Info
Periodical
Defect and Diffusion Forum (Volumes 258-260)
Edited by
Andreas Öchsner and José Grácio
Pages
294-298
DOI
10.4028/www.scientific.net/DDF.258-260.294
Citation
I. Pong, S. C. Hopkins, X. W. Fu, B. A. Glowacki, J. Elliott, A. Baldini, "Reactive Diffusion in Cu-Nb-Sn Internal Tin Superconducting Wires for the ITER Project", Defect and Diffusion Forum, Vols. 258-260, pp. 294-298, 2006
Online since
October 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Fabiana Buracovas, Valéria S. Gonçalves, Cláudio José da Rocha, Ricardo Mendes Leal Neto
Abstract:In this work shake milling were used to mechanically activate Nb – Al powder mixtures at different relative proportions (Nb80Al, Nb65Al,...
152
Authors: Jean Louis Soubeyroux, C.W. Zhang, Andre Sulpice, Lian Zhou, X.D. Tang, Robert F. Tournier
Abstract:The layer growth of the A15 (Nb3Sn) superconducting phase produced by the internal tin method on model monofilament wires was studied by...
1901
Authors: Benoît Ter-Ovanessian, Cedric Berrest, Julien Deleume, Jean Marc Cloué, Eric Andrieu
Abstract:Many studies have emphasized the beneficial effect of niobium on the physical metallurgy of Ni-Cr-Fe alloy 718. Among the different...
161
  | Authors: Stephane Knittel, Stéphane Mathieu, Michel Vilasi
Abstract:This work focuses on the effect of tin additions (2, 5 and 8%) to the MASC alloy (Nb-25Ti-8Hf-2Cr-2Al-18Si) on the microstructure and the...
575
Authors: Xiao Yan Xu, Ya Feng Lu, Ming Liang, Peng Fei Wang, Xiao Bo Ma, Cheng Shan Li
Abstract:The annealing effects on the microstructure of Cu-Nb microcomposites fabricated by bundling and drawing process have been studied. During...
163