Influence of carbon deficiency on phase formation and thermal stability of super-hard TaCy thin films. (May 2018)

• Record Type: Journal Article
• Authors: Riedl, H.; Glechner, T.; Wojcik, T.; Koutná, N.; Kolozsvári, S.; Paneta, V.; Holec, D.; Primetzhofer, D.; Mayrhofer, P.H.
• Is Part Of: Scripta materialia. Number 149(2018)
• Page Start: 150
• Page End: 154
• Publication Date: 2018-05
• Subjects: Ta-C -- Thin films -- Carbon vacancies -- UHTC -- Density Functional Theory (DFT); Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.02.030
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Using nonreactive sputter deposition allows the preparation of single-phase fcc structured TaCy thin films over a wide compositional range with y between 0.63 and 1.04. Among this composition range, the C-deficient TaC0.78 exhibits the highest as deposited hardness of 43.4 ± 0.65 GPa combined with the highest thermal stability. Even after vacuum annealing to 2400 °C, no vacancy-ordered or faulted Ta-C based phases can be detected. The stabilization of carbon deficient fcc structured TaCy near y of about 0.75, revealed the decisive character of vacancy engineered thin films materials for ultra-high temperature applications. Graphical abstract: Unlabelled Image