| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1502895 | Scripta Materialia | 2006 | 6 Pages |
Abstract
The evolution of oxidation-induced growth stresses in single crystal stoichiometric NiAl has been studied; it is specimen dependent and also depends on crystallographic orientation. Epitaxial issues at the NiAl/Al2O3 interface appear to govern initial formation of γ- or θ-Al2O3 and its subsequent transformation to the stable and denser α-Al2O3 polymorph. This transformation generates tensile stresses in α-Al2O3, which relax with further oxidation. Room temperature residual stresses are large, ∼3.3 GPa, and compressive. Confocal photo-stimulated microspectroscopy studies of these residual compressive stresses have revealed large spatial variabilities, which are also attributed to epitaxial issues at the NiAl/Al2O3 interfaces.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
A.H. Heuer, A. Reddy, D.B. Hovis, B. Veal, A. Paulikas, A. Vlad, M. Rühle,