Anisotropic Oxidation Resistance in a Ni-Base Single Crystal Superalloy

摘要

A study on the anisotropic oxidation resistance in a Ni-base single crystal superalloy was investigatedat 1000 C. Overall, the specimens with (100) face showed a higher oxidation rate compared with thespecimens with (110) face. These results showed that the anisotropic oxidation resistance occurred inthis study. The formation of the oxide scales on the surfaces of superalloy produces a large number ofshort-circuit diffusion paths. These short-circuit diffusion paths were influenced by thecrystallographic orientations during oxidation which finally results in various oxidation rates as afunction of the specimen orientations. This anisotropic oxidation resistance can be triggered by thedifferent structure of /interface acting as rapid diffusion paths for cations diffusion during oxidationin the superalloy. Furthermore, the difference in NiO grain size oxides scale structure and the thicknessof oxide scale can be used to clarify the oxidation anisotropy in a Ni-base single crystal superalloy.