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首页> 外文期刊>Journal of Vacuum Science & Technology, A. Vacuum, Surfaces, and Films >Effect of WN content on toughness enhancement in V1-xWxN/MgO(001) thin films
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Effect of WN content on toughness enhancement in V1-xWxN/MgO(001) thin films

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The authors report the growth and mechanical properties of epitaxial B1 NaCl-structure V1-xWxN/MgO(001) thin films with 0 <= x <= 0.60. The Gibbs free energy of mixing, calculated using density functional theory (DFT), reveals that cubic V1-xWxN solid solutions with 0 <= x less than or similar to 0.7 are stable against spinodal decomposition and separation into the equilibrium cubic-VN and hexagonal-WN binary phases. The authors show experimentally that alloying VN with WN leads to a monotonic increase in relaxed lattice parameters, enhanced nanoindentation hardnesses, and reduced elastic moduli. Calculated V1-xWxN lattice parameters and elastic moduli (obtained from calculated C-11, C-12, and C-44 elastic constants) are in good agreement with experimental results. The observed increase in alloy hardness, with a corresponding decrease in the elastic modulus at higher x values, combined with DFT-calculated decreases in shear to bulk moduli ratios, and increased Cauchy pressures (C-12-C-44) with increasing x reveal a trend toward increased toughness. (C) 2014 American Vacuum Society.

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