By M. J. Bennett, G. W. Lorimer
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Example text
The review of Van Vlack [4]). Small internal oxide particles near the internal oxidation fronthaveahigh Si-content and consist mostly of Si02. Dual phase inclusions consisting of wustite and silicate (probably fayalite) are present near scale/sub scale interfaces (Fig. 1). Combination and accumulation of silicate lead to accelerated grain boundary oxidation and metallic grains are isolated from the metal substrate by liquid silicate. Formation of liquid appears to be a selfcatalysing process through rapid transport of oxygen to the interface.
MICROSCOPY OF OXIDATION Figure 3: BSE images of inner scale on slabs showing fayalite(F), wustite(W) and magnetite(M).
Grabke and H. Viefhaus Max-Planck-Institut [iir Eisenforschung, D-4000 Dusseldorf, FRG. ABSTRACT In the oxidation of alloys phenomena at the interface oxide/metal are important for the nucleation, adherence and morphology of oxide scales. Such phenomena can be observed by AES and LEED in the initial stages of oxidation or after laying bare the interface by fracture or spallation of the oxide. Three studies are reported: 1. In the system Fe-AI-Ti-C the formation of a thin epitaxial layer of Ti(C,O) beneath the alumina layer favours the nucleation of a-A1203 and improves its adherence.