Thermal stability of TiAlN/CrN multilayer coatings studied by Atom Probe Tomography
- Thermal stability of TiAlN/CrN multilayer coatings studied by Atom Probe Tomography
- P.P. Choi; I. Povstugar; 안재평; A. Kostka; D. Raabe
- Hard coating; atom probe microscopy; multilayer; thermal stability; atom probe tomography
- Issue Date
- IFES 2010
- The present study gives insights into the microstructural evolution of TiAlN/CrN multilayers (with a nominal Ti:Al ratio of 0.75:0.25 and bilayer thicknesses of 8.2 to 9.5 nm) upon thermal treatment. Pulsed laser atom probe analyses were performed in conjunction with transmission electron microscopy and X-ray diffraction. The layers are found to be thermally stable up to 600°C. At 700°C the TiAlN layers begin to decompose into TiN and AlN. Further increase in temperature to 1000°C leads to a strong decomposition of the multilayer structure as well as grain coarsening. Layer dissolution and grain coarsening appear to begin at the surface. Domains of AlN and TiCrN larger than 100 nm are found, where smaller nano-sized AlN precipitates within the TiCrN matrix. Fe and V impurities are detected in the multilayers as well, which diffuse from the steel substrate into the coating along columnar grain boundaries.
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