The microstructure of NbTi superconducting composite wire for ITER project

Li, J.F.; Zhang, P.X.; Liu, X.H.; Li, J.S.; Feng, Yang; Du, S. J.; Wang, T.C.; Liu, W.T.; Grunblatt, G.; Verwaerde, Christophe; Hoang, Gia Ky

doi:10.1016/j.physc.2008.05.096

Cited by 22 publications

(11 citation statements)

References 4 publications

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“…Additionally, the cold drawing increases the length of the Ti precipitates between grains from 50-100 nm to 1-10 μm [38]. The shapes, locations, and directions of Ti precipitates between grains also affect the critical current density of the wires [50]. The highest critical current density in NbTi wires was obtained for a content of Ti precipitates between grains in the range from 25 to 33% [41,51].…”

Section: Physical Properties and Pinning Centers In Nbti Wiresmentioning

confidence: 99%

Analysis Method of High-Field Pinning Centers in NbTi Wires and MgB2 Wires

Gajda

2018

J Low Temp Phys

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The main purpose of this article is to show an easier and more accurate method for analyzing high-field pinning centers. Previous methods did not allow for precise analysis and research on high-field pinning centers, they studied only the dominant pinning mechanism, and they required a maximum of pinning force (F pmax) to analyze pinning centers. The main advantage of this method can be used in samples without the maximum pinning force required by other methods to analyze the pinning mechanism. In addition, this method allows us to observe even small changes in the density of individual pinning centers. This method is based on analysis of critical current density values in different ranges of reduced magnetic field. The method of analysis of highfield pinning centers allows primarily to develop methods and directions for creation of high-field pinning centers. The surface pinning centers are strong pinning centers in low magnetic fields and very weak pinning centers in middle and high magnetic fields. Additionally, the analysis of pinning centers shows that dislocations, strains, substitutions in the crystal lattice, and precipitation inside the grains create strong pinning centers in high magnetic fields and very weak pinning centers in low and middle magnetic fields. Research indicates that strains, substitutions in the crystal lattice, and precipitates inside grains form pinning centers that operate in the high magnetic field range.

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Section: Physical Properties and Pinning Centers In Nbti Wiresmentioning

confidence: 99%

Analysis Method of High-Field Pinning Centers in NbTi Wires and MgB2 Wires

Gajda

2018

J Low Temp Phys

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“…When the T2 of heat treatment schedule would be used, it needs a higher final drawing strain (usually above 5) [6]. But increasing number of heat treatment is not benefit for raising the Jc [7]. According to results of strand B, we decided a new design for the strand C. The testing results of strand C meet the ITER requirements.…”

Section: A Critical Current Density Resistive Transition Index " "mentioning

confidence: 99%

Development of Fine Filament NbTi Superconducting Strands for ITER

Liu

Feng

et al. 2010

IEEE Trans. Appl. Supercond.

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The NbTi superconducting wires are used for the Poloidal Field (PF) coil of International Thermonuclear Experimental Reactor (ITER). Western Superconducting Technologies Co., Ltd. (WST) has produced conventional NbTi superconducting strand by single stacking for ITER. The final strands has been heat-treated with different duration. The properties of the NbTi strands meet the requirements to ITER PF strand specification. The diameter of the strand is 0.73 mm and filament diameter is 7.8 m. The multifilament composite strand is made up of Nb-Ti filaments embedded in a high purity Cu matrix. This paper presents the results of comparative investigations on critical currents(Ic), critical current density(Jc), AC losses of the strands.

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“…Superconducting Behavior To study the superconducting behavior of the composite material, we measured I c and determined J c from the current voltage characteristic (the table). The calculation results show that, in a magnetic field with an induction of 5 T, which is closest to fields in which NbTi superconductors are extensively used, the current density is 8.7 × 10 3 A/cm 2 , which is an order of magnitude less than the current density in a mul tifiber superconductor, i.e., (3-8) × 10 4 A/cm 2 [2][3][4].…”

Section: Effect Of Annealing On Hardening During Deformationmentioning

confidence: 99%

“…It is known that low temperature commercial superconductors based on the NbTi alloy remain the most widely used materials to produce superconductive magnetic systems for research, and industrial instruments ranging from medical diagnostic MR scanners and magnetic separators to a thermonuclear reactor such as the International Thermonuclear Experimental Reactor [1,2].…”

Section: Introductionmentioning

confidence: 99%

Effect of pulse current on deformability, structure, and properties of NbTi alloy superconductor

Frolova¹,

Stolyarov²

2013

J. Mach. Manuf. Reliab.

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The effect of pulsed current on the deformability, structure, and properties of a supercon ductor based on the Nb-47 wt % Ti alloy after electroplastic deformation is studied. It is shown that the use of a pulsed current during rolling makes it possible to produce a nanocrystalline structure in the alloy and improve its microhardness, as well as to reveal the electroplastic effect in it. It is found that electroplastic deformation does not suppress the superconductivity effect.

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The microstructure of NbTi superconducting composite wire for ITER project

Cited by 22 publications

References 4 publications

Analysis Method of High-Field Pinning Centers in NbTi Wires and MgB2 Wires

Analysis Method of High-Field Pinning Centers in NbTi Wires and MgB2 Wires

Development of Fine Filament NbTi Superconducting Strands for ITER

Effect of pulse current on deformability, structure, and properties of NbTi alloy superconductor

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