| Autor: | J.G. Chacon-Nava, F.H. Stott, A. Martinez-Villafane, G. C. Wood |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Materials science
health care facilities manpower and services education Alloy Non-blocking I/O Metallurgy Metals and Alloys Oxide chemistry.chemical_element engineering.material Thermal diffusivity Oxygen Inorganic Chemistry Metal chemistry.chemical_compound chemistry Chemical engineering Aluminium visual_art Materials Chemistry engineering visual_art.visual_art_medium Internal oxidation health care economics and organizations |
| Zdroj: | Oxidation of Metals. 57:267-279 |
| ISSN: | 0030-770X |
| DOI: | 10.1023/a:1014874202052 |
| Popis: | A study of the internal oxidation of dilute Ni–Al alloys in an NiO/Ni Rhines pack was performed at 800, 1000, and 1100°C. Considerable deviations from the classical internal oxidation model have been observed. The rate of internal oxidation depends not only on the concentration of the alloying element but also on its nature, which contributes to determining the size, shape, orientation and distribution of the internal oxide precipitates. For instance, the precipitates in the Ni–Al alloys are continuous rods, arranged in a cone-shaped configuration that extends from the surface to the internal oxide front. The observed depths of internal oxidation for the various concentrations of aluminum are discussed and related to the morphologies of the internal oxide precipitates. The apparent N(s)oDo values determined from internal oxide penetrations increase with increasing solute content in the alloy. It is postulated that diffusivity of oxygen is enhanced along the internal oxide–metal matrix interface compared with that in the metal matrix. |
| Databáze: | OpenAIRE |
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