Influence of microstructure on the properties of bronze-processed multifilamentary wire

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The A15 layer of a commercial Airco wire containing 2869 Nb filaments was analyzed as a function of heat treatment. Its microstructure is composed of three morphologically concentric shells. The central shell consists of fine equiaxed grains and has a nearly stoichiometric Sn concentration. High resolution electron microscopic analysis suggests that the fine grains are formed through the polygonization of dislocations. The homogeneous composition through the fine-grained layer is a probable consequence of the small grain size, which permits relatively rapid chemical redistributions through grain boundary diffusion. In contrast, the chemical gradient in the large-grained inner and outer sheels is ... continued below

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Pages: 28

Creation Information

Wu, I.W.; Dietderich, D.R.; Hassenzahl, W.V. & Morris, J.W. Jr. May 1, 1983.

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Description

The A15 layer of a commercial Airco wire containing 2869 Nb filaments was analyzed as a function of heat treatment. Its microstructure is composed of three morphologically concentric shells. The central shell consists of fine equiaxed grains and has a nearly stoichiometric Sn concentration. High resolution electron microscopic analysis suggests that the fine grains are formed through the polygonization of dislocations. The homogeneous composition through the fine-grained layer is a probable consequence of the small grain size, which permits relatively rapid chemical redistributions through grain boundary diffusion. In contrast, the chemical gradient in the large-grained inner and outer sheels is steep. The microstructure is established by the reaction heat treatment, and determines the critical current. The best combination of grain size, composition, and volume of the fine-grained shell is obtained with an intermediate reaction temperature (700 to 730/sup 0/C); this temperature range also yields the best values of J/sub c/. Various two-step heat treatments were studied and compared to isothermal aging. The best microstructure and, hence, the best critical current characteristic was obtained by aging the specimen at 700/sup 0/C for 4 days followed by 730/sup 0/ for 2 days.

Physical Description

Pages: 28

Notes

NTIS, PC A03/MF A01.

Source

  • US/Japan workshop on high field superconducting materials for fusion, San Diego, CA, USA, 23 Apr 1983

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  • Other: DE83016999
  • Report No.: LBL-16230
  • Report No.: CONF-8305124-1
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/5864175 | External Link
  • Office of Scientific & Technical Information Report Number: 5864175
  • Archival Resource Key: ark:/67531/metadc1100522

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • May 1, 1983

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • April 25, 2018, 4:44 p.m.

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Wu, I.W.; Dietderich, D.R.; Hassenzahl, W.V. & Morris, J.W. Jr. Influence of microstructure on the properties of bronze-processed multifilamentary wire, report, May 1, 1983; [Berkeley,] California. (digital.library.unt.edu/ark:/67531/metadc1100522/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.