The Phase Relationships in Nb3Sn Wires at Low Temperatures as Detected by Crystallographical (Neutron and X-ray Diffraction) and by Physical [Bc2(T), Jc vs. ɛ] Measurements

Flükiger, R.; Schauer, W.; Specking, W.; Oddi, L.; Pintschovius, L.; Müllner, W.; Lachal, Bernard Marie

doi:10.1007/978-1-4613-3542-9_35

Cited by 15 publications

(22 citation statements)

References 17 publications

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“…Assuming the thermal expansion constants and elastic ones equal to and 110 GPa for , and 124 GPa for Bronze and and 114 GPa for , respectively, we estimated a residual strain of 0.10% at room temperature for on the basis of the axial stress balance [10]. In this calculation, we also assumed that only is yielded at above 20.7 MPa and Bronze becomes very soft at 600 K [7]. The estimated axial residual strain mentioned above is in agreement with the experimental result obtained from the neutron diffraction as shown in Table II.…”

Section: Methodsmentioning

confidence: 99%

“…Flükiger et al carried out a neutron diffraction study for the bronze route wires without reinforcement and discussed the relation between superconductivity and Martensitic tetragonal transformation [7]. They showed that neutron diffraction is a suitable tool for structure analysis and evaluation of the relative change of the lattice parameters.…”

Section: Introductionmentioning

confidence: 98%

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Neutron Diffraction Study on Prebending Effects for Bronze Route<tex>$rm Nb_3rm Sn$</tex>Wires Without Reinforcement

Awaji

Oguro

Nishijima

et al. 2006

IEEE Trans. Appl. Supercond.

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The critical current, upper critical field and critical temperature of bronze route Nb 3 Sn commercial wires are enhanced by applying a repeated bending strain at room temperature, i.e., "prebending strain". In order to investigate the prebending effects from a viewpoint of a residual strain, axial and lateral residual strains were evaluated directly by neutron diffraction at room temperature. We found that the axial residual strain changes from 0.10% to 0.02 % but the lateral one is unchanged by applying a prebending strain of 0.5% for an ordinary bronze route (Nb Ti) 3 Sn wires without reinforcement. Hence, in the case of the ordinary Nb 3 Sn wires without reinforcement, the prebending treatment modifies only the axial residual strain states independently to the lateral one, although it may depend on the wire structure. The critical current properties under the axial tensile strain suggest that the axial residual strain is reduced by about 0.11% but the radial residual strain unchanged by the prebending treatment of 0.5%. This is consistent with the results of the neutron diffraction.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Neutron Diffraction Study on Prebending Effects for Bronze Route<tex>$rm Nb_3rm Sn$</tex>Wires Without Reinforcement

Awaji

Oguro

Nishijima

et al. 2006

IEEE Trans. Appl. Supercond.

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“…Neutron diffraction measurements can been used for determining the residual strain in the different phases of strands [1], [2]. Here we report neutron diffraction measurements that have been carried out at room temperature (RT) and at 10 K in order to determine the strain state of the different phases in a powder-in-tube (PIT) strand mounted on a critical current measurement barrel made of Ti-6Al-4V alloy.…”

mentioning

confidence: 99%

Residual Strain in a ${\rm Nb}_{3}{\rm Sn}$ Strand Mounted on a Barrel for Critical Current Measurements

Thilly

Scheuerlein

Stuhr

et al. 2009

IEEE Trans. Appl. Supercond.

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Abstract-The strain dependence of the critical properties ofNb 3 Sn superconducting strands is a major complication for critical current ( ) measurements. We report neutron diffraction measurements that have been carried out at room temperature and at 10 K in order to determine the strain state of a Nb 3 Sn powder-in-tube (PIT) strand mounted on a critical current measurement barrel made out of a Ti-6Al-4V alloy.

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“…This is quite important in studying the effects of strain on the superconducting properties in composite superconducting conductors. In the 1980s, the lattice distortions of Nb 3 Sn in composite wires were investigated for the first time by Flükiger [4]. In that experiment, however, 2500 wires of 0.2 mm diameter were stacked to make a large volume for the strain measurements since the neutron flux was not strong enough to evaluate the strain in the Nb 3 Sn wires at that time.…”

Section: Introductionmentioning

confidence: 99%

Quantitative strain measurement in Nb₃Sn wire and cable conductors using high-energy x-ray and neutron beams

Awaji

2013

Supercond. Sci. Technol.

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In order to understand the effects of strain on the superconducting properties in composite Nb 3 Sn wires and cables, the three-dimensional (3D) strain is very important. Quantum beams such as neutron and synchrotron radiation enable us to quantify the detailed internal strain in any direction nondestructively. Therefore, quantum beams are recognized as a powerful tool to evaluate the 3D strain inside composite materials. The internal strain states of Nb 3 Sn strands in thick conduits such as cable-in-conduit conductors can also be detected because of the large penetration depth of neutrons. Because of advances in neutron and synchrotron radiation facilities, recent studies have examined the internal strains in composite superconducting wire and cable conductors. This paper reviews recent studies on 3D strains and their effects on the superconducting properties of Nb 3 Sn wires and cable conductors, along with some experimental data. Other applications of quantum beams for superconducting wires are also introduced briefly.

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The Phase Relationships in Nb3Sn Wires at Low Temperatures as Detected by Crystallographical (Neutron and X-ray Diffraction) and by Physical [Bc2(T), Jc vs. ɛ] Measurements

Cited by 15 publications

References 17 publications

Neutron Diffraction Study on Prebending Effects for Bronze Route<tex>$rm Nb_3rm Sn$</tex>Wires Without Reinforcement

Neutron Diffraction Study on Prebending Effects for Bronze Route<tex>$rm Nb_3rm Sn$</tex>Wires Without Reinforcement

Residual Strain in a ${\rm Nb}_{3}{\rm Sn}$ Strand Mounted on a Barrel for Critical Current Measurements

Quantitative strain measurement in Nb₃Sn wire and cable conductors using high-energy x-ray and neutron beams

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The Phase Relationships in Nb3Sn Wires at Low Temperatures as Detected by Crystallographical (Neutron and X-ray Diffraction) and by Physical [Bc2(T), Jc vs. ɛ] Measurements

Cited by 15 publications

References 17 publications

Neutron Diffraction Study on Prebending Effects for Bronze Route<tex>$rm Nb_3rm Sn$</tex>Wires Without Reinforcement

Neutron Diffraction Study on Prebending Effects for Bronze Route<tex>$rm Nb_3rm Sn$</tex>Wires Without Reinforcement

Residual Strain in a ${\rm Nb}_{3}{\rm Sn}$ Strand Mounted on a Barrel for Critical Current Measurements

Quantitative strain measurement in Nb3Sn wire and cable conductors using high-energy x-ray and neutron beams

Contact Info

Product

Resources

About

Quantitative strain measurement in Nb₃Sn wire and cable conductors using high-energy x-ray and neutron beams