The formation of subscales of varying compositions
| Autor: | D. P. Whittle, F. Gesmundo, B. D. Bastow, G. C. Wood |
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| Rok vydání: | 1981 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Scale (ratio) Alloy technology industry and agriculture Metals and Alloys Oxide Thermodynamics engineering.material Condensed Matter Physics Kinetic energy Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Phase (matter) engineering General Materials Science Diffusion (business) Internal oxidation Solid solution |
| Zdroj: | Philosophical Magazine A. 44:43-62 |
| ISSN: | 1460-6992 0141-8610 |
| DOI: | 10.1080/01418618108244493 |
| Popis: | An earlier paper (Bastow, Whittle and Wood 1977) presented an analysis of the diffusion processes taking place in the surface scale when a binary alloy was oxidized and the resulting scale consisted of a solid solution of the oxides of the individual alloy components. However, it is shown here that if the diffusion of the oxidant into the alloy is significant then, in addition to the formation of a surface scale, a subscale consisting of precipitate particles of the solid-solution scale can form within the alloy. Unlike the classical cases of internal oxidation, the precipitated oxide is the same phase as the surface scale, although its composition is different and varies with depth below the surface. In addition, the fraction of precipitated subscale also varies with depth below the surface. Diffusion equations are established to describe these systems. The importance of the thermodynamic parameters, namely the relative stabilities of the two scale components, and the kinetic parameters, oxidant... |
| Databáze: | OpenAIRE |
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