Structural evolution of Ti/TiC multilayers
- 1 May 2004
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 95 (9), 4662-4669
- https://doi.org/10.1063/1.1689002
Abstract
Hard coatings based on metal/ceramic multilayers with periods in the nanometer range have been shown to possess some potential for improved tribological and mechanical properties. The present work is concerned with the structural evolution of (Ti/TiC) multilayers. Two kinds of multilayers consisting of 30 equithick (40 nm)TiC layers and 20 and 60 nm thick Ti layers, respectively, were sputter deposited on Mo substrates. The structural and the compositional evolution of these multilayers were examined by x-ray diffraction, transition electron microscopy (TEM), high-resolution TEM, Auger electron microscopy spectroscopy and differential thermal analysis (DTA), in the as-deposited state and after various heat treatments up to 500 °C. Initially, the Ti layers had a crystalline columnar grain structure displaying a (002) texture. The TiC layers displayed weak crystallinity with a pronounced (111) texture. In the course of the heat treatments, carbon diffused from the carbide layer into the adjacent Ti layers transforming the latter into off-stoichiometric with and simultaneously depleting the carbon content of the initial carbide layer. The formed layers maintained the textural relationship with the neighboring TiC layers, consistent with a transformation that involved only a ABAB to ABC stacking change of the Ti sublattice. Increased mobility of the Ti atoms in carbon-depleted original TiC layers led to their full or partial recrystallization. The thermal effects associated both with the transformation of Ti layers into TiC, due to the influx of carbon atoms, and with the recrystallization of the original TiC layers were clearly revealed by the DTA measurements.
Keywords
This publication has 19 references indexed in Scilit:
- Structural and Mechanical Properties of TiC/Ti and TiC/B4C Multilayers Deposited by Pulsed Laser DepositionJournal of Materials Research, 2002
- Evidence for stable stoichiometric Ti2C at the interface in TiC particulate reinforced Ti alloy compositesActa Materialia, 2000
- Hardness measurements of Ti and TiC multilayers: a modelThin Solid Films, 2000
- Thermal stability of a Cu/Ta multilayer: an intriguing interfacial reactionActa Materialia, 1999
- Temperature dependence of microstructure and magnetic properties of Co/Ti multilayer thin filmsJournal of Applied Physics, 1997
- In situ TEM observation of metastable phase formed by solid state interdiffusion in a Co–Cu systemThin Solid Films, 1997
- Microstructural evolution of NiFe/Ag multilayers studied by X-ray diffraction and in situ high-resolution TEMJournal of Magnetism and Magnetic Materials, 1995
- Structure and hardness enhancement of Fe/TiC multilayered filmsNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1995
- Microstructural characterization of Co/Cu multilayersJournal of Magnetism and Magnetic Materials, 1994
- Structure and thermal evolution of Ag-Ni multilayersJournal of Materials Science, 1992