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• W638005619 abstract "The effects of minor-elements, mainly Hf, Y and Si, on the oxidation behavior of Al2O3-scale forming γ-Ni + γ’-Ni3Al-based alloy and coating compositions were investigated. Firstly, the effects of Si addition on Hf+Y co-doped γ+γ’ alloys were assessed on both modified-Rene N5 superalloy and model alloys. It was found that the addition of Si (≤ 1 at. %) decreased the overall weight gain of modified-Rene N5 superalloy and Ni-20Al-5Cr-0.05Hf-0.05Y (at. %) model alloy under both isothermal (up to 1000 hours) and cyclic (up to 1000 1h cycles) oxidation conditions at 1150°C. Secondly, the effect of Si (1 at. %) addition on the meta-stable → α-Al2O3 transformation kinetics during the early stage of oxidation was studied on the Ni-20Al-5Cr-0.05Hf-0.05Y model alloy. It was found that the addition of 1 at. % Si delays the θ → α-Al2O3 transformation at temperatures above 900°C. In addition, an alternative mathematical method was developed to determine the θ → α-Al2O3 transformation based on analyzing the time dependence of instantaneous n-value. This method found success in describing the effect of Si addition in delaying the θ → α-Al2O3 transformation on Ni-20Al-5Cr-0.05Hf-0.05Y model alloy. Thirdly, synergistic effect of Si (1 at. %) and Hf/Y on the early stage oxidation behavior of Ni-20Al-5Cr-0.05Hf-0.05Y model alloy was studied by TEM/STEM/EDS. Significantly different microstructures of Al2O3 scale formed on the Si-free and Si-containing alloys were observed after 10 and 30 minutes of oxidation at 1150°C. The Al2O3 scale formed on the Si-free alloy contained a large amount of Ni-rich particles in the region close to the scale/metal interface. By contrast, for the Si-containing alloy, a layer of quickly established large-grained α-Al2O3 was observed in the region close to the scale/metal interface. Segregation behavior of Hf and Y was also influenced by the addition of Si. After 2 hours of oxidation at 1150°C, excessive non-uniform Hf and Y co-segregation was observed at the grain boundaries of Al2O3 scale formed on the Si-free alloy. By contrast, Hf and Y grain boundary segregations were uniform and well-controlled in the Al2O3 scale formed on the Si-containing alloy." @default.
• W638005619 created "2016-06-24" @default.
• W638005619 creator A5036230558 @default.
• W638005619 date "2015-01-28" @default.
• W638005619 modified "2023-09-27" @default.
• W638005619 title "Investigation of the Minor-Element Effects on the Oxidation Behavior of γ-NI + γ’-NI3AL Alloys" @default.
• W638005619 hasPublicationYear "2015" @default.
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