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Structural parameters of the low-temperature metastable form of the carbide W2C

  • Physicochemical And Structural Investigations Of Materials
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Powder Metallurgy and Metal Ceramics Aims and scope

Abstract

A sufficiently complete spectrum of superstructure reflections was obtained by the x-ray diffraction analysis of a monocrystal to unequivocally determine, for the first time, the ordered structure of W2C annealed for a long time at a temperature below that of its eutectoidal decomposition. It was shown that W2C of eutectoidal composition in a metastable state has a rhombic ordered structure with the lattice parameters a=4.719 ± ± 0.003 nm × 10=c0, b=6.017 ± 0.003 nm × 10 ≈ 2a0, c=5.181 ± 0.003 nm × 10 ≈ √3a0 (a0, c0 ≡ aHCP, cHCP). The specimens were obtained from tungsten alloys containing 30.5 and 35 at. % C, prepared by are melting followed by annealing at ∼2700°C (1 h) and stepwise cooling to 850°C (the total annealing time at temperatures below 1200°C was 538 h).

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Authors and Affiliations

  1. Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kiev

    V. Z. Kublii, T. Y. Velikanova, O. A. Gnitetskii & S. I. Makhovitskaya

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  1. V. Z. Kublii
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  2. T. Y. Velikanova
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  3. O. A. Gnitetskii
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  4. S. I. Makhovitskaya
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Translated from Poroshkovaya Metallurgiya, Nos. 3/4(412), pp. 46–53, March–April, 2000.

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Kublii, V.Z., Velikanova, T.Y., Gnitetskii, O.A. et al. Structural parameters of the low-temperature metastable form of the carbide W2C. Powder Metall Met Ceram 39, 151–156 (2000). https://doi.org/10.1007/BF02678637

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  • DOI: https://doi.org/10.1007/BF02678637

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