title: Phase Formation and Oxidation Behavior at 500 °C in a Ni-Co-Al Thin-Film Materials Library.
abstract: The complete ternary system Ni-Co-Al was fabricated as a thin film materials library by combinatorial magnetron sputtering and was annealed subsequently in several steps in Ar and under atmospheric conditions at 500 °C. Ni-Co-Al is the base system for both Ni- and Co-based superalloys. Therefore, the phases occurring in this system and their oxidation behavior is of high interest. The Ni-Co-Al materials library was investigated using high-throughput characterization methods such as optical measurements, resistance screening, automated EDX, automated XRD, and XPS. From the obtained data a thin film phase diagram for the Ni-Co-Al system in its state after annealing at 500 °C in air was established. Furthermore, a surface oxide composition map of the full Ni-Co-Al system for oxidation at 500 °C was concluded. As a result, it could be shown that at 500 °C an amount of 10 at. % Al is necessary for a Ni-Co-Al thin film to produce a protective Al-oxide scale.
authors.affiliation: Institute for Materials, Ruhr-Universität Bochum , 44780 Bochum, Germany.
authors.forename: Dennis
authors.initials: D
authors.lastname: Naujoks
authors.affiliation: Institute for Materials, Ruhr-Universität Bochum , 44780 Bochum, Germany.
authors.forename: Jerome
authors.initials: J
authors.lastname: Richert
authors.affiliation: Institute for Materials, Ruhr-Universität Bochum , 44780 Bochum, Germany.
authors.forename: Peer
authors.initials: P
authors.lastname: Decker
authors.affiliation: Department of Materials Science, Friedrich-Alexander University Erlangen-Nürnberg , 91058 Erlangen, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Weiser
authors.affiliation: Department of Materials Science, Friedrich-Alexander University Erlangen-Nürnberg , 91058 Erlangen, Germany.
authors.forename: Sannakaisa
authors.initials: S
authors.lastname: Virtanen
authors.affiliation: Institute for Materials, Ruhr-Universität Bochum , 44780 Bochum, Germany.
authors.forename: Alfred
authors.initials: A
authors.lastname: Ludwig
mesh_terms: D000497:Alloys / Q000138:chemical synthesis*; D000535:Aluminum / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D004553:Electric Conductivity; D009532:Nickel / Q000737:chemistry*; D010084:Oxidation-Reduction; D044367:Phase Transition; D013499:Surface Properties; D013696:Temperature
chemical_list: D000497:Alloys; D003035:Cobalt; D009532:Nickel; D000535:Aluminum
keywords: EDX; XPS; materials library; oxidation; superalloy; thin film