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Development of cube texture in cold-rolled and annealed multilayer tapes for coated superconductor applications
Published in American Ceramic Society
2008
Volume: 201
   
Pages: 381 - 390
Abstract
Possibility of preparing Ni base multilayer tapes having configurations Ni (outer layer)/Ni-5at.%W(core) and Ni/Ni-5at.%W(core)/Ni through a powder metallurgy route has been investigated for use as coated superconductor substrate applications. Development of cube texture ({100}<00l>) after heavy cold rolling (∼95% reduction in thickness) and annealing was studied in the Ni side(s) of these multilayer Ni tapes and this was compared and contrasted to a monolithic unalloyed Ni tape prepared from the same elemental powder. Interestingly, the sharpness of the cube texture was found to be significantly enhanced on the Ni side(s) of the multilayer tapes as compared to the monolithic Ni tape although the deformation textures of these materials do not reveal any perceptible difference, qualitatively as well as quantitatively. The increased texture sharpness on the Ni sides(s) of the tapes coincides with significant diffusion of W from the alloy side to the Ni side(s) which is confirmed from the cross sectional EDS analyses of the multilayer tapes. These observations indicate the beneficial effect of W in enhancing the cube volume fraction in Ni. The difference in orientations of early recrystallized grains of Ni and Ni-W alloys has been suggested to be the possible reason behind the observed difference in the enhanced cube texture sharpness in the Ni side(s) of the multilayer tapes.
About the journal
JournalCeramic Transactions
PublisherAmerican Ceramic Society
ISSN10421122