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Swadzba, Radoslaw and Bauer, Peter-Philipp (2021) Microstructure formation and high temperature oxidation behavior of Ti-Al-Cr-Y-Si coatings on TiAl. Applied Surface Science, 562, p. 150191. Elsevier. doi: 10.1016/j.apsusc.2021.150191. ISSN 0169-4332.
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Official URL: http://dx.doi.org/10.1016/j.apsusc.2021.150191
Abstract
The paper presents the application of Closed Hollow Cathode Physical Vapor Deposition (CHC-PVD) method for the depostion of Ti-Al-Cr-Y-Si coatings on γ-TiAl 48-2-2 alloy for high temperature oxidation protection. The study concerned the analysis of the coating’s growth mechanism, initial microstructure as well as phase transformations investigations using high resolution Scanning Transmission Electron Microscopy (STEM) and high temperature X-ray diffraction (HT-XRD). The coated alloy was subjected to high temperature oxidation test at 850 °C where a fivefold lower mass gain compared to bare 48-2-2 alloy was observed. Detailed microstructural investigations allowed to characterize the thermally grown oxide scale, which was found to be composed of nanometric layers of titania, equiaxed (Al,Cr)2O3 and columnar alumina. These investigations provided microstructural evidence for the Cr effect on the formation of Al2O3, which was postulated previously. Yttrium was found to segregate to the grain boundaries of alumina oxide scale during high temperature oxidation, indicating the occurence of the reactive element effect.
| Item URL in elib: | https://elib.dlr.de/145971/ | ||||||||||||
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| Document Type: | Article | ||||||||||||
| Title: | Microstructure formation and high temperature oxidation behavior of Ti-Al-Cr-Y-Si coatings on TiAl | ||||||||||||
| Authors: |
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| Date: | October 2021 | ||||||||||||
| Journal or Publication Title: | Applied Surface Science | ||||||||||||
| Refereed publication: | Yes | ||||||||||||
| Open Access: | Yes | ||||||||||||
| Gold Open Access: | No | ||||||||||||
| In SCOPUS: | Yes | ||||||||||||
| In ISI Web of Science: | Yes | ||||||||||||
| Volume: | 562 | ||||||||||||
| DOI: | 10.1016/j.apsusc.2021.150191 | ||||||||||||
| Page Range: | p. 150191 | ||||||||||||
| Publisher: | Elsevier | ||||||||||||
| ISSN: | 0169-4332 | ||||||||||||
| Status: | Published | ||||||||||||
| Keywords: | γ-TiAl Coatings Deposition High temperature oxidation Reactive element effect | ||||||||||||
| HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||
| HGF - Program: | Aeronautics | ||||||||||||
| HGF - Program Themes: | Clean Propulsion | ||||||||||||
| DLR - Research area: | Aeronautics | ||||||||||||
| DLR - Program: | L CP - Clean Propulsion | ||||||||||||
| DLR - Research theme (Project): | L - Future Engines and Engine Integration | ||||||||||||
| Location: | Köln-Porz | ||||||||||||
| Institutes and Institutions: | Institute of Materials Research > High Temperature and Functional Coatings | ||||||||||||
| Deposited By: | Bauer, Peter-Philipp | ||||||||||||
| Deposited On: | 24 Nov 2021 10:48 | ||||||||||||
| Last Modified: | 24 Nov 2021 10:48 |
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