The Effect of Crystallographic Orientation on the Oxidation Behavior of a Single-Crystal Nickel-Base Superalloy |
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Authors: | Yuan FH Han EH Jo CY Li TF Hu ZQ |
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Affiliation: | (1) State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, People's Republic of China;(2) High Temperature Materials Laboratory, Korea Institute of Machinery and Materials, 66 Sangnam Dong, Changwon, Kyungnam, 641-010, Korea |
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Abstract: | The oxidation kinetics of DD100 nickel-base single-crystal alloy, with (221) and (100) surface orientations were tested in this study by thermogravimetry. A pronounced anisotropy in both the cyclic and isothermal oxidation resistance of DD100 alloy was observed. The (221) crystallographic surface of DD100 had a slower oxidation rate than the (100) surface when isothermally exposed to stationary air at 950°C, whereas the opposite results were obtained at 1050°C. When cyclically oxidized at 1100°C, the weight loss of samples with (221) surfaces was significantly greater than that of (100) surfaces, so that the cyclic-oxidation anisotropy was more remarkable at 1100°C than at 950°C. The different spatial alignment of the ![gamma](/content/g165317683n37j05/xxlarge947.gif) / interface is thought to be responsible for the anisotropic oxidation behavior of the nickel-base single crystal alloy. |
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Keywords: | Single-crystal nickel-base superalloy high-temperature oxidation oxidation kinetics oxidation anisotropy |
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