Stability of External α-Al2O3 Scales on Alloy 602 CA at 1100–1200 °C
| Autor: | Daniel Grüner, R. Swadźba, Egbert Wessel, W. J. Quadakkers, Rishi Pillai, Timur Galiullin, A. Chyrkin |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Precipitation (chemistry) 020209 energy Alloy Metals and Alloys Analytical chemistry 02 engineering and technology engineering.material Chromia Inorganic Chemistry Electron diffraction Metallic materials 0202 electrical engineering electronic engineering information engineering Materials Chemistry engineering Internal oxidation CALPHAD Electron backscatter diffraction |
| Zdroj: | Oxidation of Metals. 90:119-133 |
| ISSN: | 1573-4889 0030-770X |
| Popis: | An external ultrathin α-Al2O3 scale grown on the Ni-base alloy 602 CA during air oxidation at 800 °C was characterized by means of high-resolution TEM/EDX and electron diffraction. Alloy samples pre-oxidized at 800 °C were subsequently exposed at 1100, 1150 and 1200 °C for up to 100 h. Whereas the external alumina remained stable at 1100 °C, with the increasing exposure temperature, the pre-grown alumina scale tended to break down resulting in an external chromia scale accompanied by internal alumina precipitation. The transition from external to internal Al oxidation was investigated using SEM/EDX/EBSD. The critical Al depletion at the scale-alloy interface during the post-exposure at 1100–1200 °C was modeled using the CALPHAD-based thermodynamic-kinetic approach. |
| Databáze: | OpenAIRE |
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