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MM: Fachverband Metall- und Materialphysik

MM 17: Topical Session (Symposium MM): Fundamentals of Fracture

MM 17.3: Vortrag

Montag, 12. März 2018, 18:00–18:15, TC 006

Micro-Mechanical Testing of Transition Metal (Oxy)Nitride Coatings — •James Gibson, Shahed Rezaei, Holger Rueß, Oliver Hunold, Stephan Wulfinghoff, Jochen Schneider, Stefanie Reese, and Sandra Korte-Kerzel — RWTH Aachen

Transition metal (oxy)nitride coatings are used in polymer forming operations for a combination of outstanding wear resistance and chemical compatibility with the polymer materials. Varying the chemical composition and deposition parameters for the coatings will optimise mechanical properties by a combination of chemistry and microstructural optimisation. By developing a representative model for these materials, these materials can be rapidly and efficiently prototyped and improved.

The effect of thin film composition and temperature on the elastic, plastic and fracture properties of transition metal nitride and oxynitride coatings was invested by nanoindentation and micro-cantilever bending. Vanadium and titanium aluminium nitride and oxynitride coatings were manufactured by high-power impulse magnetron sputtering on silicon substrates. Notched micro-cantilever beams were used to determine values of fracture toughness. Tests were carried out to 500C in-situ using a Nanomechanics inSEM system. Results are explained via DFT modelling of the coating chemistry, and integrated into a cohesive-zone element finite element model.