Influence of Alloy Composition and Exposure Conditions on the Selective Oxidation Behavior of Ni–Al Alloys

摘要: Ni–Al coating alloys, which are commonly used in gas turbine engines operating marine environments, highly susceptible to hot corrosion attack. The effect of alloy composition and exposure conditions on the development a protective alumina scale, is important for resistance alloy, how they affect transition from θ α polymorph have been evaluated. A series model alloys with base Ni–36 at.% Al, 5 additions Cr, Pt Si were exposed dry air air–10%H2O at 900 °C. presence water vapor led higher oxidation rates retarded θ- α-Al2O3 transformation. behavior formed differed depending alloying element considered. Additions Cr accelerated transformation, while it.