Influence of combined deformation and heat treatment on the superconducting properties of a niobium-titanium alloy

Белошенко, В. А.; Matrosov, N. I.; Chishko, V. V.; Mironova, O. N.; Medvedskaya, E. A.; Gajda, D.; Zaleski, A.; Dyakonov, V. P.; Puźniak, R.; Szymczak, H.

doi:10.1063/1.2966714

Cited by 7 publications

(14 citation statements)

References 2 publications

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“…Gajda et al [18] showed for the first time that dislocations effectively increase J c in magnetic fields from 6 to 8 T in NbTi. There are several methods that allow us to obtain high-field pinning centers and more connections between the grains in superconducting wires, tapes, bulks, and thin layers, e.g., cold drawing (CD) [20,[24][25][26], equal-channel multi-angle pressing (ECMAP) [27,28], cold rolling (CR) [25,29], cold pressure (CP) [30], hot isostatic pressure (HIP) [25,31,32], and C doping [33][34][35][36].…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…In [16], it was stated that the Cu-NbTi composite specimens prepared using ECMAP (e = 13.12) and without it have the second order microstresses 1.96 × 10 -3 and 1.96 × 10 -3 , respectively. It follows that the action of the first factor is doubtful.…”

Section: Resultsmentioning

confidence: 99%

Low-temperature internal friction of fiber composites with a copper matrix

et al. 2015

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The temperature dependences of the internal friction and shear modulus of composites with a copper matrix reinforced with fibers of different functional purposes (Cu, Fe, Al, NbTi) have been studied in the temperature range of 100-300 K. The internal friction demonstrates a peak located in a narrow temper ature range and caused by a thermally activated relaxation process. It has been shown that its behavior is due to a number of technological factors whose combination determines the strength of adhesive bond of the composite components. The observed fact makes it possible to use the internal friction as a nondestructive method of controlling the adhesion strength of a fiber-matrix compound.

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“…Next, the NbTi wires were treated with the two methods: traditional method and equal channel multi-angle pressing (ECMAP) [1]. The traditional method included hydroextrusion (HE) and the process of drawing.…”

Section: Samples Preparationmentioning

confidence: 99%

“…The degree of deformation was e = 0.82 per pass [1]. The samples were obtained in four various passes ECMAP: first, after 4 passes -e = 3.28, second after 8 passes e -6.56, third after 12 passes e -9.84, fourth after 16 passes e -13.12.…”

Section: Samples Preparationmentioning

confidence: 99%

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Pinning Force in Superconducting Wires Nb-Ti

Gajda

Zaleski

Dyakonov³

et al. 2010

Acta Phys. Pol. A

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In the paper we present the results of the measurements of critical current I c in NbTi wires. Experiments were made for the wires of 0.3 mm in diameter and the length of 25 mm. The wires were produced by means of two methods: conventional (hydroextrusion and drawing) and preliminary equal channel multiple angle pressing. The samples were heat treated at different temperatures. We describe the influence of different pinning centers on critical current density J c .

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Influence of combined deformation and heat treatment on the superconducting properties of a niobium-titanium alloy

Cited by 7 publications

References 2 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

Low-temperature internal friction of fiber composites with a copper matrix

Pinning Force in Superconducting Wires Nb-Ti

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