Development and characterization of nickel-copper-based substrates for 2

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Abstract

The employment of cuprate superconductors such as YBa2Cu3O7-δ(YBCO) for power application requires the realization of quasi-single crystal wires in order to avoid depression of supercurrent caused by weaks links originated by high-angle grain boundaries. One solution is the epitaxial deposition of μm-thick films on flexible, biaxially textured metal tapes known as coated conductors. The proper crystallographic orientation {001}, i.e. cube orientation, can be induced in fcc metals with a medium-high stacking fault energy by cold-rolling to a high deformation degree followed by high-temperature recrystallization treatment. Ni and Ni-alloys were thoroughly studied during the past 15 years. In particular Ni-W alloys are presently successfully employed as textured substrates. More recently, copper and nickel-copper alloys tapes were investigated as alternative substrates for YBCO coated conductors, in order to overcome the possible limitations due to the ferromagnetic losses and at the same time reduce the cost of the raw materials. In this chapter, we report about the recent developments of ternary nickel-copper-based substrates, since the introduction of a third element lead to a stable recrystallization texture with respect to the binary Ni 50 at% Cu (Ni-Cu) alloy, which has been taken as parent alloy. In particular, two systems have been studied. The first is the Ni-Cu-Wxalloy, with x = 0.5-3 at%, which shows a Curie temperature below 22 K. For x > 2 at% the alloy is inhomogeneous and a cube texture is formed for x < 1 at%. The other is the Ni-Cu-Co3 alloy, which shows a Curie temperature as high as 155 K and develops a sharp cube texture. For this alloy also Ni:Cu atomic ratios 2:3 and 3:2 were studied. Cu-poor alloy has a sharp cube texture development and a Curie temperature as high as 275 K, besides Cu-rich alloy has a depressed Curie temperature to 60 K but develops a less sharp cube texture. An application of YBCO film deposition to test the suitability of Ni-Cu-based substrates for the development of YBCO coated conductor is reported. © 2011 by Nova Science Publishers, Inc. All rights reserved.
Original languageEnglish
Title of host publicationCopper Alloys: Preparation, Properties and Applications
PublisherNova Science Publishers, Inc.
Publication statusPublished - Mar 2011
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Vannozzi, A., & Celentano, G. (2011). Development and characterization of nickel-copper-based substrates for 2. In Copper Alloys: Preparation, Properties and Applications Nova Science Publishers, Inc..