Elementary Mechanisms During the Early Stages of Scale Formation on Single Crystalline Co- and Ni-base Superalloys at High Temperatures
Excellent resistance against oxide scale formation is essential for the application of newly designed alloys at high temperatures. Therefore, the detailed understanding of oxidation processes is crucial for the successful design of new materials for application. In the course of the present thesis,...
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FAU University Press
2025
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| Online pristup: | ONIX_20251215T160703_9783961472147_51 |
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| _version_ | 1869524506756775936 |
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| author | Weiser, Martin |
| author_browse | Weiser, Martin |
| author_facet | Weiser, Martin |
| author_sort | Weiser, Martin |
| collection | Directory of Open Access Books |
| description | Excellent resistance against oxide scale formation is essential for the application of newly designed alloys at high temperatures. Therefore, the detailed understanding of oxidation processes is crucial for the successful design of new materials for application. In the course of the present thesis, oxide scale formation on single-crystalline, γ′-strengthened Co- and Ni-base model alloys was investigated. Results derived by classical thermogravimetry and sequential exposure to ¹⁶/¹⁸O₂ were supplemented by various sophisticated, surface analytical techniques. The impact of the two-phase microstructure during the early stages of scale formation could be demonstrated by high-resolution transmission electron microscopy for the ternary Co-Al-W system. Kinetic processes during high-temperature oxidation of ternary model alloys were investigated depending on the W content between 800 and 900 °C. Furthermore, the role of base elements (Co or Ni) was elucidated with the help of another single-crystalline model alloy series. The development of diffusion-limiting barrier layers as well as the formation of unwanted phases could be directly correlated to the Co/Ni ratio in the alloy. Two-stage tracer exchange experiments in ¹⁶/¹⁸O₂-containing atmospheres were conducted to investigate the transport of reactants through growing oxide scales. Besides counter-current transport of cations and anions along different paths also the development of pores and microchannels was confirmed by the selected experimental approach. |
| format | Online |
| id | doab-20.500.12854ir-170254 |
| institution | Directory of Open Access Books |
| language | eng |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | FAU University Press |
| publisherStr | FAU University Press |
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| spelling | doab-20.500.12854ir-1702542025-12-16T05:38:51Z Elementary Mechanisms During the Early Stages of Scale Formation on Single Crystalline Co- and Ni-base Superalloys at High Temperatures Weiser, Martin Sperrschicht Innere Oxidation Thermische Oxidation Elektronenmikroskopie Hochtemperatur Sekundärionen-Massenspektrometrie Cobaltlegierung thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TD Industrial chemistry and manufacturing technologies::TDC Industrial chemistry and chemical engineering::TDCX Process engineering technology and techniques thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGM Materials science Excellent resistance against oxide scale formation is essential for the application of newly designed alloys at high temperatures. Therefore, the detailed understanding of oxidation processes is crucial for the successful design of new materials for application. In the course of the present thesis, oxide scale formation on single-crystalline, γ′-strengthened Co- and Ni-base model alloys was investigated. Results derived by classical thermogravimetry and sequential exposure to ¹⁶/¹⁸O₂ were supplemented by various sophisticated, surface analytical techniques. The impact of the two-phase microstructure during the early stages of scale formation could be demonstrated by high-resolution transmission electron microscopy for the ternary Co-Al-W system. Kinetic processes during high-temperature oxidation of ternary model alloys were investigated depending on the W content between 800 and 900 °C. Furthermore, the role of base elements (Co or Ni) was elucidated with the help of another single-crystalline model alloy series. The development of diffusion-limiting barrier layers as well as the formation of unwanted phases could be directly correlated to the Co/Ni ratio in the alloy. Two-stage tracer exchange experiments in ¹⁶/¹⁸O₂-containing atmospheres were conducted to investigate the transport of reactants through growing oxide scales. Besides counter-current transport of cations and anions along different paths also the development of pores and microchannels was confirmed by the selected experimental approach. 2025-12-16T05:38:50Z 2025-12-16T05:38:50Z 2025-12-15T15:11:14Z 2019 book ONIX_20251215T160703_9783961472147_51 https://library.oapen.org/handle/20.500.12657/109220 9783961472147 9783961472130 https://directory.doabooks.org/handle/20.500.12854/170254 eng FAU Studien Materialwissenschaft und Werkstofftechnik open access image/jpeg Attribution 4.0 International https://library.oapen.org/bitstream/20.500.12657/109220/1/9783961472147.pdf FAU University Press 10.25593/978-3-96147-214-7 10.25593/978-3-96147-214-7 2c600dea-eece-4066-87be-da335e323fdb 9783961472147 9783961472130 196 Erlangen open access |
| spellingShingle | Sperrschicht Innere Oxidation Thermische Oxidation Elektronenmikroskopie Hochtemperatur Sekundärionen-Massenspektrometrie Cobaltlegierung thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TD Industrial chemistry and manufacturing technologies::TDC Industrial chemistry and chemical engineering::TDCX Process engineering technology and techniques thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGM Materials science Weiser, Martin Elementary Mechanisms During the Early Stages of Scale Formation on Single Crystalline Co- and Ni-base Superalloys at High Temperatures |
| title | Elementary Mechanisms During the Early Stages of Scale Formation on Single Crystalline Co- and Ni-base Superalloys at High Temperatures |
| title_full | Elementary Mechanisms During the Early Stages of Scale Formation on Single Crystalline Co- and Ni-base Superalloys at High Temperatures |
| title_fullStr | Elementary Mechanisms During the Early Stages of Scale Formation on Single Crystalline Co- and Ni-base Superalloys at High Temperatures |
| title_full_unstemmed | Elementary Mechanisms During the Early Stages of Scale Formation on Single Crystalline Co- and Ni-base Superalloys at High Temperatures |
| title_short | Elementary Mechanisms During the Early Stages of Scale Formation on Single Crystalline Co- and Ni-base Superalloys at High Temperatures |
| title_sort | elementary mechanisms during the early stages of scale formation on single crystalline co and ni base superalloys at high temperatures |
| topic | Sperrschicht Innere Oxidation Thermische Oxidation Elektronenmikroskopie Hochtemperatur Sekundärionen-Massenspektrometrie Cobaltlegierung thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TD Industrial chemistry and manufacturing technologies::TDC Industrial chemistry and chemical engineering::TDCX Process engineering technology and techniques thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGM Materials science |
| topic_facet | Sperrschicht Innere Oxidation Thermische Oxidation Elektronenmikroskopie Hochtemperatur Sekundärionen-Massenspektrometrie Cobaltlegierung thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TD Industrial chemistry and manufacturing technologies::TDC Industrial chemistry and chemical engineering::TDCX Process engineering technology and techniques thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGM Materials science |
| url | ONIX_20251215T160703_9783961472147_51 |
| work_keys_str_mv | AT weisermartin elementarymechanismsduringtheearlystagesofscaleformationonsinglecrystallinecoandnibasesuperalloysathightemperatures |