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Oxidation of metals investigated by in situ surface sensitive X-ray diffraction

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Published/Copyright: January 3, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 93 Issue 8

Abstract

The onset of the oxidation of epitaxial Cr films and NiAl single crystals will be discussed, that was characterized by surface sensitive X-ray diffraction techniques. From X-ray reflectivity measurements atomic-scale information on the oxide thickness, its roughness and the metal/oxide interfacial morphology can be obtained. As an example, time-resolved reflectivity measurements during the oxidation of Cr are presented, which allow the determination of an activation barrier for Cr ion diffusion through the growing oxide layer. The structure and defects of the growing Cr2O3 layers are in addition visualized in cross-section high-resolution transmission microscopy images. In the case of the oxidation of NiAl (110) the formation of Al2O3 overlayers was observed, leaving behind a chemically disturbed substrate. Here, so-called crystal truncation rod measurements provide information about the oxidation-induced defect formation close to the NiAl/Al2O3 interface. In the case of the oxidation of NiAl (110) Al anti-site atoms are present at the interface, which are forbidden in the Ni –Al volume phase diagram.

Abstract

Es werden Ergebnisse zum Anfangsstadium der Oxidation von epiktaktischen Cr-Schichten und NiAl-Einkristallen beschrieben, die mit Hilfe von oberflächensensitiven Röntgenbeugungsmethoden erzielt wurden. Aus Röntgen-Reflexionsmessungen können Informationen über Oxiddicken, Rauhigkeiten und über die Morphologie der Metall/Oxid-Grenzfläche gewonnen werden. Als Beispiel werden zeitaufgelöste Reflexionsmessungen zur Oxidation von Cr präsentiert, die es erlauben, die Aktivierungsenergie der diffundierenden Cr-Ionen durch die wachsende Oxidschicht zu bestimmen. Die Struktur und die Defekte der sich bildenden Cr2O3-Schichten werden weiterhin durch hochauflösende Transmissionselektronenmikroskopiebilder verdeutlicht. Während der Oxidation von NiAl wurde die Ausbildung von Al2O3-Schichten beobachtet, wobei ein chemisch gestörtes Substrat zurückgelassen wird. In diesem Fall liefert asymptotische Bragg-Streuung Informationen über oxidationsinduzierte Defektbildung nahe der NiAl/ Al2O3-Grenzfläche. In Falle der Oxidation von NiAl (110) wurde die Ausbildung von Al-Antistrukturatomen an der Grenzfläche beobachtet, die im Ni –Al-Volumenphasendiagramm verboten sind.

Keywords: Oxidation; X-ray diffraction; Surfaces; Interfaces; Cr films; NiAl single crystals
Dr. Andreas Stierle Max-Planck-Institut für Metallforschung Heisenbergstr. 1, D-70569 Stuttgart, Germany Tel.: +49 711 689 1842 Fax: +49 711 689 1902

The author would like to thank M. Kelsch for the high-resolution transmission electron microscopy sample preparation and performance of the measurements

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Received: 2002-03-19
Published Online: 2022-01-03

© 2002 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Articles/Aufsätze
  3. Peierls barriers, kinks, and flow stress: Recent progress
  4. Positron annihilation spectroscopy – a non-destructive method for lifetime prediction in the field of dynamical material testing
  5. Diffusion bonding of gamma-based titanium aluminides
  6. A nanotheory of the intense slip localization causing metal fatigue
  7. Dislocation and surface structures of copper and very-low-carbon steel at low fatigue amplitudes
  8. Effect of hafnium on the castability of directionally solidified nickel-base superalloys
  9. Polysiloxane-derived ceramic foam for the reinforcement of Mg alloy
  10. Biomechanical behaviour of implant-reinforced subcapital humeral fractures
  11. Thermodynamic modeling of the Ni – In system
  12. Oxidation of metals investigated by in situ surface sensitive X-ray diffraction
  13. Embrittlement of Cu [001] symmetric tilt boundaries induced by Sb segregation
  14. The microstructure of a Mg-10 wt.% Al alloy
  15. Notifications/Mitteilungen
  16. Personal/Personelles
  17. Books/Bücher
  18. Books/DGM
  19. Conferences/Konferenzen
https://doi.org/10.3139/ijmr-2002-0139
Keywords for this article
Oxidation; X-ray diffraction; Surfaces; Interfaces; Cr films; NiAl single crystals

Articles in the same Issue

  1. Frontmatter
  2. Articles/Aufsätze
  3. Peierls barriers, kinks, and flow stress: Recent progress
  4. Positron annihilation spectroscopy – a non-destructive method for lifetime prediction in the field of dynamical material testing
  5. Diffusion bonding of gamma-based titanium aluminides
  6. A nanotheory of the intense slip localization causing metal fatigue
  7. Dislocation and surface structures of copper and very-low-carbon steel at low fatigue amplitudes
  8. Effect of hafnium on the castability of directionally solidified nickel-base superalloys
  9. Polysiloxane-derived ceramic foam for the reinforcement of Mg alloy
  10. Biomechanical behaviour of implant-reinforced subcapital humeral fractures
  11. Thermodynamic modeling of the Ni – In system
  12. Oxidation of metals investigated by in situ surface sensitive X-ray diffraction
  13. Embrittlement of Cu [001] symmetric tilt boundaries induced by Sb segregation
  14. The microstructure of a Mg-10 wt.% Al alloy
  15. Notifications/Mitteilungen
  16. Personal/Personelles
  17. Books/Bücher
  18. Books/DGM
  19. Conferences/Konferenzen
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