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Microstructure and superconducting properties of melt-quenched insoluble Al-Pb and Al-Pb-Bi alloys

Inoue, A. ; Yano, N. ; Matsuzaki, K. ; Masumoto, T.

Journal of Materials Science, 1987, Vol.22(1), pp.123-131 [Tạp chí có phản biện]

ISSN: 0022-2461 ; E-ISSN: 1573-4803 ; DOI: 10.1007/BF01160560

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  • Nhan đề:
    Microstructure and superconducting properties of melt-quenched insoluble Al-Pb and Al-Pb-Bi alloys
  • Tác giả: Inoue, A. ; Yano, N. ; Matsuzaki, K. ; Masumoto, T.
  • Chủ đề: Specialty Metals Industry -- Analysis
  • Là 1 phần của: Journal of Materials Science, 1987, Vol.22(1), pp.123-131
  • Mô tả: In order to obtain aluminium-based superconducting alloys including finely dispersed lead or Pb-Bi particles, the application of the melt-quenching technique has been tried for Al-Pb, Al-Si-Pb and Al-Si-Pb-Bi alloys containing immiscible elements such as lead and bismuth. It has been found to result in the preparation of superconducting materials consisting of fcc Pb or h c p ε(Pb-Bi) particles dispersed finely and densely in the aluminium-based matrix in each composition range below about 2 at % Pb for Al-Pb alloys and 5 at % Pb or (Pb + Bi) for (Al 0.9 Si 0.1 ) 100− x Pb x and (Al 0.9 Si 0.1 ) 100− x (Pb 0.6 Bi 0.4 ) x alloys. The particle size and interparticle distance were ∼ 40 nm and 40 to 100 nm, respectively, within the grains, and ∼ 100 nm and below ∼ 30 nm, respectively, at the grain boundaries for the lead phase in Al 98 Pb 2 alloy. Particle size was ∼ 15 to 60 nm and interpartide distance 30 to 60 nm for the Pb- Bi phase in (Al 0.9 Si 0.1 ) 95 (Pb 0.6 Bi 0.4 ) 5 Transition temperature, T c was 4.16 K for Al 98 Pb 2 , 3.94K for (Al 0.9 Si 0.1 ) 95 Pb 5 and 7.75 K for (Al 0.9 Si 0.1 ) 95 (Pb 0.6 Bi 0.4 ) 5 . The upper critical magnetic field, H c2 , and critical current density, J c , for (Al 0.9 Si 0.1 ) 95 (Pb 0.6 Bi 0.4 ) 5 were 0.22 T at 4.2 K and 1.67 × 10 7 Am −2 atzeroappliedheld and 4.2 K. The appearance of the superconductivity for the aluminium -based alloys was interpreted as due to the formation of superconducting percolation path along the tangled dislocations, sub-boundaries and/or grain boundaries where Pb and Pb-Bi phases precipitated preferentially.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0022-2461 ; E-ISSN: 1573-4803 ; DOI: 10.1007/BF01160560

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