Application of Transverse-Section Analytical Electron Microscopy to the Study of Oxidation of Metal Alloys

摘要

We have applied the transverse section analytical electron microscopy technique to study the so-called reactive-element effect in Fe-Cr-Y alloys. In all alloys that were investigated, Y was precipitated as Y sub 2 (Fe,Cr) sub 17 . Precipitates that were close to the oxidizing interface were observed to oxidize internally. Internal oxidation of a single Y sub 2 (Fe,Cr) sub 17 precipitate leads to formation of a colony of much smaller Y sub 2 O sub 3 particles. These particles are not incorporated into the scale during oxidation. The Y additions were found to strongly affect the microstructural evolution of the growing oxide scale. (ERA citation 09:024903)