As-deformed filament's density and transport currents of MgB2/Ti/Glidcop wire

Kòváč, Pavol; Hušek, I; Pachla, W.; Kulczyk, Mariusz; Melíšek, T; Dvorák, Tomáš

doi:10.1016/j.jallcom.2011.06.071

Cited by 19 publications

(14 citation statements)

References 12 publications

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“…Only IEE19S wire heat treated at low temperature (600 • C/2.5 h) behaves significantly more strongly. The effect of variable deformations applied for IEE30G shows the strengthening of as-drawn wire (D) by two-axial rolling (TAR) and also by rotary swaging (RS) due to filament densification [7].…”

Section: Resultsmentioning

confidence: 99%

“…IEE use an in situ PIT process with Mg + B + SiC powder mixture, Ti barrier and two materials of outer sheath: stainless steel 316L and GlidCop R AL-60 sheaths. Hydro-extrusion, drawing and rolling are applied for these wire's formation [5,7]. Finally, the heat treatment at 'low' (600 • C) and also at 'high' temperature 800 • C is performed.…”

Section: Filamentary Mgb 2 Wiresmentioning

confidence: 99%

“…The outer sheath of the wire is important from the viewpoint of drawing deformation, thermal stabilization and mechanical reinforcement. Up to now, mainly Monel, stainless steel (SS) and GlidCop R have been used for outer sheathing of MgB 2 wires [3][4][5][6][7]. The final heat treatment has an important effect on the superconducting properties of MgB 2 filaments, but also on the mechanical properties because it influences the strength of all composite elements [8].…”

Section: Introductionmentioning

confidence: 99%

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Behaviour of filamentary MgB₂wires subjected to tensile stress at 4.2 K

Kòváč

Kopera

Melíšek

et al. 2013

Supercond. Sci. Technol.

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Different filamentary MgB 2 wires have been subjected to tensile stress at 4.2 K. Stress-strain and critical current versus stress and strain characteristics of wires differing by filament architecture, sheath materials, deformation and heat treatment were measured and compared. It was found that the linear increase of critical current due to the pre-compression effect (ranging from 5% up to ≈20%) is affected by thermal expansion and the strength of used metallic sheaths. The values of irreversible strain ε irr and stress σ irr depend dominantly on the applied outer sheath and its final heat treatment conditions. Consequently, the strain-tolerance of MgB 2 wires is influenced by several parameters and it is difficult to see a clear relation between I c (ε) and σ (ε) characteristics. The lowest ε irr was measured for Monel sheathed wires (0.3-0.6%), medium for GlidCop R sheath (0.48-0.6%), and the highest ε irr = 0.6-0.9% were obtained for MgB 2 wires reinforced by the stainless steel 316L annealed at temperature between 600 and 800 • C. The highest ε irr = 0.9% and σ irr = 900 MPa were measured for the work-hardened steel, which is not considerably softened by the heat treatment at 600 • C/2.5 h.

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Section: Resultsmentioning

confidence: 99%

Section: Filamentary Mgb 2 Wiresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Behaviour of filamentary MgB₂wires subjected to tensile stress at 4.2 K

Kòváč

Kopera

Melíšek

et al. 2013

Supercond. Sci. Technol.

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“…Proses pembentukan kawat selanjutnya dilakukan dengan proses rolling merupakan proses deformasi plastis yang merupakan metode pembentukan sederhana yang dapat meningkatkan sifat mekanik material namun menurunkan keuletan [13]. Faktor yang penting dalam pembentukan kawat MgB 2 adalah rasio dari area cross-sectional material inti terhadap area cross-sectional pembungkus karena dapat mempengaruhi kapasitan arus dan densifikasi material inti [14]. Fraksi komposisi dari Mg dan B pada kawat MgB2 sangat penting untuk mencapai kerapatan arus kritis yang tinggi [15].…”

Section: Pendahuluanunclassified

Fabrikasi Kawat Resistansi Nol Berbahan MgB2/Stainless Steel dengan Variasi Reduksi Ukuran melalui Pengerolan Dingin terhadap Karakteristik Mekanik dan Struktur Mikro

Herbirowo¹,

Pramono²

2021

energi

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Magnesium Diboride (MgB2) is a high potential material for medical and electrical applications with zero resistance and high efficiency. The raw materials of Mg powder with a purity of 98% and B amorphous with a purity of 95%, were mixed with a ratio of 1:2, ground for 2 hours using an agate mortar, and subsequently compacted and inserted into stainelss steel (SS) tube by powder-in-tube (PIT). The SS tube was previously annealed at 900°C for 1 hour. The sintering process was carried out using a muffle furnace at a temperature of 800°C for 1 hour, followed by cold wire rolling with gradual reduction. The samples were characterized for their mechanical properties using Vickers microhardness tester and ultimate tensile test machine. Surface morphologies of samples were observed using optical microscope and SEM-EDAX Superconducting properties were measured with the cryogenic resistance measurement. The highest hardness value of 377,2 HV was achieved at a 60% size reduction along with the tensile strength of 1381 KN/mm. The results of the morphological observation showed homogeneous deformation without any cracks, with the the grain shape tended to be crystalline. The superconductivity test showed the phenomenon of zero resistance at a critical temperature of 39.55K at a 40% reduction in MgB2 wire

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“…In addition, any chemical reaction of metallic sheath with MgB 2 filaments is undesirable and has to be protected by inert barrier material. Until now, several metallic materials have been used for the outer sheath of MgB 2 wires made by PIT: Cu, Ni, Monel, GlidCop, and stainless steel [5][6][7][8][9]. The stronger the outer sheath, the higher the density the MgB powder mixture is and consequently, denser MgB 2 filaments are created during the final heat treatment [10].…”

Section: Introductionmentioning

confidence: 99%

Lightweight MgB₂ wires with a high temperature aluminum sheath made of variable purity Al powder and Al₂O₃ content

Kòváč

Hušek

Kulich

et al. 2018

Supercond. Sci. Technol.

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The properties of high temperature aluminum (HITEMAL, hereinafter HIT) composites made of powders with different particle sizes ranging from 0.8-3 μm and purities of 99.9%-99.996% were tested. The thermal, electrical, and mechanical properties of these materials were examined and compared with pure Al. Three different HIT materials were used for the outer sheath of single-core MgB 2 wires with a Ti barrier manufactured by internal magnesium diffusion into a boron process. The critical currents, thermal stability, and strain tolerances of the MgB 2 /Ti/HIT wires were measured at liquid He temperature. It was found that the Al powder purity and particle size used for HIT affect the performance of MgB 2 wires. A sheath made of high purity Al powder allows better thermal stability of MgB 2 wire, but the strain tolerance is lower in comparison to the wire with HIT made of less pure powder and higher Al 2 O 3 content. The presented wire configurations are promising for lightweight, thermally stabile, and strain tolerant superconducting MgB 2 wires.

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As-deformed filament's density and transport currents of MgB2/Ti/Glidcop wire

Cited by 19 publications

References 12 publications

Behaviour of filamentary MgB₂wires subjected to tensile stress at 4.2 K

Behaviour of filamentary MgB₂wires subjected to tensile stress at 4.2 K

Fabrikasi Kawat Resistansi Nol Berbahan MgB2/Stainless Steel dengan Variasi Reduksi Ukuran melalui Pengerolan Dingin terhadap Karakteristik Mekanik dan Struktur Mikro

Lightweight MgB₂ wires with a high temperature aluminum sheath made of variable purity Al powder and Al₂O₃ content

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As-deformed filament's density and transport currents of MgB2/Ti/Glidcop wire

Cited by 19 publications

References 12 publications

Behaviour of filamentary MgB2wires subjected to tensile stress at 4.2 K

Behaviour of filamentary MgB2wires subjected to tensile stress at 4.2 K

Fabrikasi Kawat Resistansi Nol Berbahan MgB2/Stainless Steel dengan Variasi Reduksi Ukuran melalui Pengerolan Dingin terhadap Karakteristik Mekanik dan Struktur Mikro

Lightweight MgB2 wires with a high temperature aluminum sheath made of variable purity Al powder and Al2O3 content

Contact Info

Product

Resources

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Behaviour of filamentary MgB₂wires subjected to tensile stress at 4.2 K

Behaviour of filamentary MgB₂wires subjected to tensile stress at 4.2 K

Lightweight MgB₂ wires with a high temperature aluminum sheath made of variable purity Al powder and Al₂O₃ content