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Size effects in the plastic deformation of NiAl thin films

  • P. Wellner , G. Dehm , O. Kraft and E. Arzt EMAIL logo
Published/Copyright: February 8, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 95 Issue 9

Abstract

This paper presents the first study of the plastic behavior of NiAl thin films with thicknesses in the micron and sub-micron range. The influence of geometrical and microstructural constraints was studied for different Al contents (45 to 50 at.% Al) and film thicknesses (0.2 to 3.1 μm) in the temperature range from 20 to 700 °C. The films were deposited on Si substrates and subjected to temperature changes resulting in thermal strains of up to 0.84%. The stress evolution in the films was measured by the substrate curvature method. The residual stress at room temperature of nearstoichiometric NiAl films significantly increased with decreasing film thickness indicating an increase of the film strength. At temperatures above 400 °C strong stress relaxation was found, which was more pronounced in thinner films suggesting the contribution of diffusional creep processes. The existence of a critical film thickness is suggested at which a transition from diffusion-controlled to dislocation-controlled plasticity occurs. The results have potential implications for the reliability of NiAl films as protective coatings in thermal engines.

Keywords: Constrained diffusional creep; Thermal stress; Nickel aluminides
Prof. Eduard Arzt Max-Planck-Institut für Metallforschung, Stuttgart, und Institut für Metallkunde der Universität Stuttgart, Heisenbergstr. 3, D-70569 Stuttgart, Germany Tel.: +49 711 689 3410 Fax: +49 711 689 3412

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Received: 2004-07-01
Accepted: 2004-07-14
Published Online: 2022-02-08

© 2004 Carl Hanser Verlag, München

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  2. Editorial
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https://doi.org/10.1515/ijmr-2004-0145
Keywords for this article
Constrained diffusional creep; Thermal stress; Nickel aluminides

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. 85 Years DGM
  5. Fachausschuss ,,Materialographie“
  6. Fachausschuss ,,Mechanische Oberflächenbehandlungen“
  7. Fachausschuss „Titan“
  8. Fachausschuss ,,Gefüge und Eigenschaften von Polymerwerkstoffen“
  9. Characterization of the fcc/bcc orientation relationship by EBSD using pole figures and variants
  10. Microstructural and thermodynamic study of γ-Ga2O3
  11. Spray forming of 2014-Al alloy based composites with injection of SiC particulates
  12. Size effects in the plastic deformation of NiAl thin films
  13. Fracture parameters of chevron-notched Al2O3/Nb sandwich specimens
  14. HVEM in situ study of fracture of Al2O3/Nb sandwich specimens
  15. Articles Basic
  16. Assessment of thermodynamic functions in the MgO–Al2O3–SiO2 system
  17. Derivation and consistency of the partial functions of a ternary system involving interaction coefficients
  18. Contribution to the zinc-rich side of the Ti–Zn system
  19. Measurement of the surface tension of liquid Ga, Bi, Sn, In and Pb by the constrained drop method
  20. Articles Applied
  21. Model of growth kinetics of nitrided layer in the binary Fe–N system
  22. Einfluss von Molybdän auf die Beständigkeit von Stahlanoden zum Verchromen in „Chromispel-C“-Elektrolyten
  23. The mechanism of columnar-to-equiaxed transition during electromagnetic centrifugal solidification
  24. Notifications/Mitteilungen
  25. Personal/Personelles
  26. News/Aktuelles
  27. Books/Bücher
  28. Conferences/Konferenzen
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