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Oxidation behaviour of TiAl-based intermetallic coatings on γ-TiAl alloys

  • Reinhold Braun , Maik Fröhlich and Christoph Leyens
Published/Copyright: June 11, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 101 Issue 5

Abstract

TiAl-based intermetallic layers with additions of Ag, Cr, Y and Hf were deposited on γ-TiAl specimens using magnetron sputtering. The oxidation behaviour of the coated Ti-45Al-8Nb (at.%) alloy was investigated at 850 °C and 900 °C under cyclic oxidation conditions in air. The ternary Ti-50Al-2Ag (at.%) coating did not provide oxidation protection to the substrate material at 850 °C. Two-phase γ-TiAl + Ti(Cr, Al)2 Laves coatings exhibited high oxidation resistance at 900 °C for up to 1000 cycles of 1 h dwell time at high temperature. During thermal exposure phase dissolution and transformation occurred. The slow oxide growth rates observed for the Ti – Al – Cr intermetallic layers were associated with the formation of a thin continuous alumina top scale established by the Laves, B2 and Z-phases. Small additions of hafnium and yttrium improved the oxidation resistance. In contrast, Ti – Al – Cr – Ag coatings exhibited poor oxidation behaviour at 900 °C.

Keywords: Titanium aluminides; Intermetallic coatings; Intermetallic phases; Oxidation resistance; Oxide scale
* Correspondence address, Dr. Reinhold Braun, DLR – German Aerospace Center, Institute of Materials Research, D-51170 Köln, Germany. Tel.: +49 2203 6 01 24 57, Fax: +49 2203 69 64 80, E-mail:

Dedicated to Professor Dr. Monika Feller-Kniepmeier on the occasion of her 80th birthday

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Received: 2009-8-31
Accepted: 2010-2-17
Published Online: 2013-06-11
Published in Print: 2010-05-01

© 2010, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Prof. Dr. Monika Feller-Kniepmeier 80th birthday
  5. Basic
  6. Model calculation of inoculation and experimental verification in two alloy-systems
  7. Enrichment of boron at grain boundaries of platinum-based alloys determined by electron energy loss spectroscopy in a transmission electron microscope
  8. Measurement of the lattice misfit of Pt–Al–Cr superalloy by convergent beam electron diffraction (CBED)
  9. Microstructural and micromechanical characterisation of a Pt–Al–Cr–Ni–Re alloy by means of transmission electron microscopy and nanoindentation
  10. X-ray reflections from the γ/γ′-microstructure of nickel-base superalloys: effect of the plane tilting
  11. Physicochemical properties and creep strength of a single crystal of nickel-base superalloy containing rhenium and ruthenium
  12. Interdependence between glass stability and phase formation sequence during crystallization of Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk glass
  13. On the formation of λ-MnAl4
  14. Applied
  15. Development of Ni–Mn-based alloys for the fast epitaxial braze-repair of single-crystalline nickel-based superalloys
  16. Influence of heat treatment and microstructure on the tensile pseudoelastic response of an Ni-rich NiTi shape memory alloy
  17. Microstructural stability of an Ni–Mo based Hastelloy after 10 MeV electron irradiation at high temperature
  18. Oxidation behaviour of TiAl-based intermetallic coatings on γ-TiAl alloys
  19. Oxidation and fatigue behaviour of γ-TiAl coated with HIPIMS CrAlYN/CrN nanoscale multilayer coatings and EB-PVD thermal barrier coatings
  20. On the stress corrosion cracking behaviour of 6XXX series aluminium alloys
  21. Investigation of surface film nanostructure and assessment of its impact on friction force stabilization during automotive braking
  22. Creep strength of a binary Al62Ti38 alloy
  23. Bowing out of a dislocation from wall of persistent slip bands (PSB)
  24. Effect of martensite volume fraction on mechanical properties of dual-phase treated AISI-4012 sheet steels
  25. The joint properties of dissimilar aluminum plates joined by friction stir welding
  26. Notification
  27. DGM News
https://doi.org/10.3139/146.110322
Keywords for this article
Titanium aluminides; Intermetallic coatings; Intermetallic phases; Oxidation resistance; Oxide scale

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Prof. Dr. Monika Feller-Kniepmeier 80th birthday
  5. Basic
  6. Model calculation of inoculation and experimental verification in two alloy-systems
  7. Enrichment of boron at grain boundaries of platinum-based alloys determined by electron energy loss spectroscopy in a transmission electron microscope
  8. Measurement of the lattice misfit of Pt–Al–Cr superalloy by convergent beam electron diffraction (CBED)
  9. Microstructural and micromechanical characterisation of a Pt–Al–Cr–Ni–Re alloy by means of transmission electron microscopy and nanoindentation
  10. X-ray reflections from the γ/γ′-microstructure of nickel-base superalloys: effect of the plane tilting
  11. Physicochemical properties and creep strength of a single crystal of nickel-base superalloy containing rhenium and ruthenium
  12. Interdependence between glass stability and phase formation sequence during crystallization of Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk glass
  13. On the formation of λ-MnAl4
  14. Applied
  15. Development of Ni–Mn-based alloys for the fast epitaxial braze-repair of single-crystalline nickel-based superalloys
  16. Influence of heat treatment and microstructure on the tensile pseudoelastic response of an Ni-rich NiTi shape memory alloy
  17. Microstructural stability of an Ni–Mo based Hastelloy after 10 MeV electron irradiation at high temperature
  18. Oxidation behaviour of TiAl-based intermetallic coatings on γ-TiAl alloys
  19. Oxidation and fatigue behaviour of γ-TiAl coated with HIPIMS CrAlYN/CrN nanoscale multilayer coatings and EB-PVD thermal barrier coatings
  20. On the stress corrosion cracking behaviour of 6XXX series aluminium alloys
  21. Investigation of surface film nanostructure and assessment of its impact on friction force stabilization during automotive braking
  22. Creep strength of a binary Al62Ti38 alloy
  23. Bowing out of a dislocation from wall of persistent slip bands (PSB)
  24. Effect of martensite volume fraction on mechanical properties of dual-phase treated AISI-4012 sheet steels
  25. The joint properties of dissimilar aluminum plates joined by friction stir welding
  26. Notification
  27. DGM News
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