Model for nonprotective oxidation of Al-Mg alloys
| Autor: | M. H. Zayan |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Materials science
Scanning electron microscope Magnesium Diffusion Alloy Metallurgy Metals and Alloys Oxide chemistry.chemical_element engineering.material Inorganic Chemistry chemistry.chemical_compound Chemical engineering chemistry Vacancy defect visual_art Materials Chemistry engineering Aluminium alloy visual_art.visual_art_medium Layer (electronics) |
| Zdroj: | Oxidation of Metals. 34:465-472 |
| ISSN: | 1573-4889 0030-770X |
| DOI: | 10.1007/bf00664426 |
| Popis: | The oxidation of Al-5Mg alloy has been studied at 550°C in dry air. Morphological details of the MgO layers which develop on this alloy during hightemperature oxidation have been studied by scanning electron microscopy (SEM). A localized detachment of the protective, adherent MgO layer was found, which is caused by voids formed by vacancy condensation at the metal-oxide interface. The source of these vacancies was the outward diffusion of Mg through the oxide layer. Continuing growth of these voids was responsible for cracking of oxide ridges and nodules, as well as the growth of new MgO having a “cauliflower” morphology. A model describing the process of the outward diffusion is given. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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