Long length nonmagnetic Ni-Cr-W biaxially textured tape for the manufacturing of cost-effective HTS wire. Mankevich, A., S., Kamenev, A., A., Blednov, A., Amelichev, V., A., Markelov, A., V., Shchukin, A., E., Kalitka, V., S., Samoilenkov, S., V., & Kaul, A., R. In Talk 2MPE-01, ASC Conference 2012, Oct. 7-12.
abstract   bibtex   
One of the approaches to produce HTS wire is based on the use of biaxially textured Ni alloy tapes as substrates. However, the ferromagnetism of pure and lightly alloyed Ni increases ac losses of the wire. The alloying of Ni with W, Cr or V reduces the Curie temperature, although lowering the alloy’s tendency to form the cubic texture. We have developed the Ni-9.2Cr-2.4W alloy and the technology to fabricate biaxially textured tapes out of it. The alloy has proved to be a reasonable compromise between its ability to form the (001)<100> cubic texture on the one hand and its favorable magnetic and mechanical properties on the other hand. The Curie temperature of this alloy is below 50 K, and we have achieved 99% fraction of cubic grains in tapes prepared by cold rolling and annealing. At present we fabricate the electropolished Ni-Cr-W tape in lengths up to 100 m with out-of-plane FWHM of 5.2 (RD), 8.7 (TD) and in-plane FWHM of 5.6 deg. We have demonstrated MgO buffer layers with excellent texture replicating that of the substrate grown on the Ni-Cr-W tape by our reel-to-reel MOCVD process. MOCVD-grown HTS layers demonstrate Ic over 100 A/cm at 77K in self field. The details of texture, microstructure and morphology of the Ni-Cr-W tape and MgO and HTS layers will be presented. Focus will be made on the comparison of the Ni-Cr-W alloy properties with those of the more common Ni-W and Hastelloy substrate materials.
@inProceedings{
 title = {Long length nonmagnetic Ni-Cr-W biaxially textured tape for the manufacturing of cost-effective HTS wire},
 type = {inProceedings},
 city = {Portland, Or},
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 abstract = {One of the approaches to produce HTS wire is based on the use of biaxially textured Ni alloy tapes as substrates. However, the ferromagnetism of pure and lightly alloyed Ni increases ac losses of the wire. The alloying of Ni with W, Cr or V reduces the Curie temperature, although lowering the alloy’s tendency to form the cubic texture. We have developed the Ni-9.2Cr-2.4W alloy and the technology to fabricate biaxially textured tapes out of it. The alloy has proved to be a reasonable compromise between its ability to form the (001)<100> cubic texture on the one hand and its favorable magnetic and mechanical properties on the other hand. The Curie temperature of this alloy is below 50 K, and we have achieved 99% fraction of cubic grains in tapes prepared by cold rolling and annealing. At present we fabricate the electropolished Ni-Cr-W tape in lengths up to 100 m with out-of-plane FWHM of 5.2 (RD), 8.7 (TD) and in-plane FWHM of 5.6 deg. We have demonstrated MgO buffer layers with excellent texture replicating that of the substrate grown on the Ni-Cr-W tape by our reel-to-reel MOCVD process. MOCVD-grown HTS layers demonstrate Ic over 100 A/cm at 77K in self field. The details of texture, microstructure and morphology of the Ni-Cr-W tape and MgO and HTS layers will be presented. Focus will be made on the comparison of the Ni-Cr-W alloy properties with those of the more common Ni-W and Hastelloy substrate materials.},
 bibtype = {inProceedings},
 author = {Mankevich, A. S. and Kamenev, A. A. and Blednov, A.V. and Amelichev, V. A. and Markelov, A. V. and Shchukin, A. E. and Kalitka, V. S. and Samoilenkov, S. V. and Kaul, A. R.},
 booktitle = {Talk 2MPE-01, ASC Conference 2012, Oct. 7-12}
}

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