Conclusions
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1.
Polycrystalline niobium monocarbide specimens exhibit pronounced strain strengthening during plastic deformation above their tough-to-brittle transition temperature, which becomes more marked with increase in the amount of carbon vacancies in the niobium monocarbide lattice. This is accompanied by an increase in point defect concentration, as a result of which the electrical resistivity of the carbide grows.
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2.
At any given deformation rate, the absolute increase in the electrical resistivity and thermo-emf of niobium monocarbide specimens is a maximum at x=0.81–0.84. The reason for this is that these compositions, which correspond to the maximum statistical weight of the stable sp3(s2p3) type electronic configurations, are the most sensitive to a change in the Fermi surface brought about by plastic deformation.
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Translated from Poroshkovaya Metallurgiya, No. 7 (139), pp. 51–57, July, 1974.
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Bychkov, A.K., Neshpor, V.S. & Ordan'yan, S.S. Effect of plastic deformation on some properties of niobium monocarbide in its homogeneity range. Powder Metall Met Ceram 13, 560–565 (1974). https://doi.org/10.1007/BF00792563
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DOI: https://doi.org/10.1007/BF00792563