Oxidation and Decomposition of Ti₂AlN MAX Phase Coating Deposited on Nickel-Based Super Alloy IN718

Abstract:

In this work, the oxidation behavior of Ti₂AlN coating deposited on nickel super alloy IN718 was investigated. The coating was obtained by DC-magnetron sputtering at 540°C and subsequent vacuum annealing at 800°C for 1h. The coating morphology as well as the chemical composition were analyzed using SEM, EDS and XRD, respectively. The XRD results revealed that the coating mainly composed of Ti₂AlN MAX phase. Cycling oxidation was performed at 700 °C and 800 °C in air. The XRD and SEM results proved the interaction between substrate and coating and the formation of the quaternary Ti₃NiAl₂N phase during oxidation at the interface. Due to the Ni diffusion towards the surface, the Ti₃NiAl₂N phase grew continuously and the Ti₂AlN phase decomposed gradually resulting in a coating failure. The results indicate that the oxidation behavior of the coating is essentially controlled by the interdiffusion of Ni from substrate into the coating.

• Periodical: Materials Science Forum (Volumes 825-826)
• Pages: 628-635
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.825-826.628
• Online since: July 2015
• Authors: Wagdi Garkas*, Maik Fröhlich, Klaus Dieter Weltmann, Christoph Leyens
• Keywords: IN718, Interdiffusion, MAX Phase, Oxidation, Ti₂AlN, Ti₃AlN

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