Observation of A15 phase transformation in RHQ-Nb3Al wire by neutron diffraction at high-temperature

Jin, Xinzhe; Nakamoto, T.; Harjo, Stefanus; Ito, Takayoshi; Ogitsu, T.; Tsuchiya, K.; Yamamoto, A.; Kikuchi, A.; Takeuchi, T.; Hemmi, T.

doi:10.1016/j.jallcom.2012.04.070

Cited by 11 publications

(7 citation statements)

References 21 publications

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“…In this case, the three-dimensional structure of voids was detected, and the formation mechanism of the voids was discussed. Nb 3 Al phase formation in RHQT processed wires was recently reported by Jin et al as well [45].…”

Section: Other Application Of Quantum Beamssupporting

confidence: 53%

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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Section: Other Application Of Quantum Beamssupporting

confidence: 53%

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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“…To obtain X-ray patterns at each turn, the beam was targeted to the center of the wire between adjacent interspaces as shown with X-ray irradiation area. To estimate a local strain in a turn with high precision, a multipeak analysis was conducted in this study [9,10]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of epoxy impregnation on strain distribution of materials in Bi2223 superconducting coils by using synchrotron X-ray diffraction

Jin¹,

Osamura

Machiya

et al. 2015

Journal of Alloys and Compounds

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“…The Nb 3 Al wire having a Nb/Ta composite matrix after A15 phase transformation was chosen for measuring the neutron diffraction [5]. The material of the inter-filament is Ta.…”

Section: Methodsmentioning

confidence: 99%

“…The material of the inter-filament is Ta. A series of neutron diffraction measurements was carried out between 23 • C (room temperature) and 800 • C in the J-PARC "TAKUMI" diffractometer with the time-of-flight (TOF) method [5], [7]. The sample was placed in a non-crystalline glass tube in a vacuum and the temperature was increased by using an infrared heater, as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

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Effect of Thermal Cycle on the Lattice Structure in $ \hbox{RHQ-Nb}_{3}\hbox{Al}$ Superconducting Wire

Jin

Nakamoto

Tsuchiya

et al. 2013

IEEE Trans. Appl. Supercond.

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In A15 superconducting wires, it is known that the critical current has a dependence on the strain in a magnetic field. Therefore, RHQ-Nb 3 Al wires are being studied to develop a high field magnet. Since the wire is usually composed of three or more materials, residual strain is induced by the different coefficients of thermal expansion in the materials in the cooling process after A15 phase transformation. In neutron diffraction measurements at room temperature, we previously reported that the residual strain of Nb 3 Al filaments in the wire is tensile. We also reported that the difference of the residual strain in Nb 3 Al filaments, as obtained at room temperature, has an effect on the tensile strain dependence of the critical current. In this study, we effectively reduced the residual strain by using a thermal cycle method after A15 phase transformation. By applying one thermal cycle process, the tensile residual strain was decreased by approximately 0.08%. This is the first investigation of the thermal cycle effect on the residual strain in the RHQ-Nb 3 Al wire. Studies on the thermal cycle are necessary to understand the mechanical properties of the wire. In this paper, we report the details of the thermal cycle method, its effect on the lattice structures of Nb 3 Al and Cu at room temperature, and the analysis results from the perspective of material strength in strain recovery and its hysteresis.Index Terms-A15, multi-peak analysis, Nb 3 Al, neutron diffraction, residual strain, RHQ.

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Observation of A15 phase transformation in RHQ-Nb3Al wire by neutron diffraction at high-temperature

Cited by 11 publications

References 21 publications

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

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

Effect of epoxy impregnation on strain distribution of materials in Bi2223 superconducting coils by using synchrotron X-ray diffraction

Effect of Thermal Cycle on the Lattice Structure in $ \hbox{RHQ-Nb}_{3}\hbox{Al}$ Superconducting Wire

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Observation of A15 phase transformation in RHQ-Nb3Al wire by neutron diffraction at high-temperature

Cited by 11 publications

References 21 publications

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

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

Effect of epoxy impregnation on strain distribution of materials in Bi2223 superconducting coils by using synchrotron X-ray diffraction

Effect of Thermal Cycle on the Lattice Structure in $ \hbox{RHQ-Nb}_{3}\hbox{Al}$ Superconducting Wire

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

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