Oxidation of Zr-based metallic glasses and nanocrystalline alloys

Oxidation kinetics of bulk Zr-based metallic glasses seems to be controlled by oxygen diffusion through the scale towards the ZrO 2/glass interface. Two modes of oxidation were observed: depending on the alloy either: (1) relative slow growth of homogeneous scales consisting of nodules or lamellae o...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2007-03, Vol.449, p.57-62
Main Authors: Köster, Uwe, Jastrow, Lioba
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion mechanisms
Corrosion prevention
Cross-sectional microscopy
Exact sciences and technology
Metals. Metallurgy
Nanocrystalline
Oxidation
Zr 67Cu 18Ni 9Al 8
Zr 70Pd 30
Zr-based metallic glass
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Summary:Oxidation kinetics of bulk Zr-based metallic glasses seems to be controlled by oxygen diffusion through the scale towards the ZrO 2/glass interface. Two modes of oxidation were observed: depending on the alloy either: (1) relative slow growth of homogeneous scales consisting of nodules or lamellae of tetragonal ZrO 2 embedding nanocrystals of the late transition metals or (2) formation of fast growing oxide cones exhibiting a lamellar structure of the tetragonal and the less dense monoclinic ZrO 2 thus allowing very fast oxygen diffusion along the interfaces between the lamellae. For both modes an influence of surface preparation on the oxidation reactions has to be mentioned. In addition, the oxidation behavior of these metallic glasses was compared with that of nanocrystalline or coarse crystalline alloys of similar composition. Whereas nanocrystallization improves the oxidation resistance of many Zr-based metallic glasses, coarse crystalline structures promote fast oxidation along grain boundaries, at least in Zr 2Pd.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2006.02.316