Webler, Ralf ; Krottenthaler, Markus ; Neumeier, Steffen ; Durst, Karsten ; Göken, Mathias (2013)
Local fracture toughness and residual stress measurements on NiAl bond coats by micro cantilever and fib-based bar milling tests.
In: Proceedings of the International Symposium on Superalloys
doi: 10.1002/9781118516430.ch10
Buchkapitel, Bibliographie
Kurzbeschreibung (Abstract)
The mechanical behavior of bond coats depends on their chemical composition. Important for the mechanical behavior is the Al content of β-NiAl based coatings. Additionally, internal stresses are present and change during thermal cycling. Therefore bond coats with different Ni and Al content in the as-coated and thermally cycled state are investigated. For the first time, new small scaled methods are used to obtain fracture toughness and internal stresses of real bond coat systems. Micro cantilever bending and stress relaxation tests were performed on a local scale by employing focused ion beam milling. Additionally, the influence of NiAl composition on Young's modulus and hardness is studied by nanoindentation. Results show an increase of Young's modulus with Al content. In off-stoichiometric NiAl a higher hardness and fracture toughness than in binary NiAl is found. The internal stresses change from tensile in as-coated to compressive stresses in thermally cycled bond coats, respectively.
| Typ des Eintrags: | Buchkapitel |
|---|---|
| Erschienen: | 2013 |
| Autor(en): | Webler, Ralf ; Krottenthaler, Markus ; Neumeier, Steffen ; Durst, Karsten ; Göken, Mathias |
| Art des Eintrags: | Bibliographie |
| Titel: | Local fracture toughness and residual stress measurements on NiAl bond coats by micro cantilever and fib-based bar milling tests |
| Sprache: | Englisch |
| Publikationsjahr: | 2013 |
| Ort: | Hobroken |
| Buchtitel: | Proceedings of the International Symposium on Superalloys |
| DOI: | 10.1002/9781118516430.ch10 |
| Kurzbeschreibung (Abstract): | The mechanical behavior of bond coats depends on their chemical composition. Important for the mechanical behavior is the Al content of β-NiAl based coatings. Additionally, internal stresses are present and change during thermal cycling. Therefore bond coats with different Ni and Al content in the as-coated and thermally cycled state are investigated. For the first time, new small scaled methods are used to obtain fracture toughness and internal stresses of real bond coat systems. Micro cantilever bending and stress relaxation tests were performed on a local scale by employing focused ion beam milling. Additionally, the influence of NiAl composition on Young's modulus and hardness is studied by nanoindentation. Results show an increase of Young's modulus with Al content. In off-stoichiometric NiAl a higher hardness and fracture toughness than in binary NiAl is found. The internal stresses change from tensile in as-coated to compressive stresses in thermally cycled bond coats, respectively. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physikalische Metallkunde |
| Hinterlegungsdatum: | 19 Jul 2018 12:14 |
| Letzte Änderung: | 08 Mai 2024 11:30 |
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