TITLE:
Oxidation Behavior of Fe3Al-5Cr- (0, 0.5, 1.5) Ti Alloys at Temperature Ranges from 800℃ to 1200 ℃
AUTHORS:
Hossam Halfa
KEYWORDS:
Intermetallic, compound, Fe3Al, scale, oxidation resistance, High temperature
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.9 No.9,
September
20,
2010
ABSTRACT: As cast Fe3Al-5Cr- (0, 0.5, 1.5) Ti alloys were isothermally oxidized at temperature ranges from 800 to 1200 ℃ in air, and their oxidation characteristics were studied using
thermogravimetric analyzer, X-ray diffractometer, optical microscope and scanning electron
microscope. It was found that Ti increased the oxidation resistance of Fe3Al- Cr alloys to a certain extent. The oxide scales that formed on the unalloyed Fe3Al alloys consisted primarily of α-Al2O3 containing a small percentage of dissolved iron and chromium ions. The experimental result of unalloyed Fe3Al alloy shows also, an Al-free, Fe-enriched zone was formed beneath the oxide scale, owing to Al consumption to form the oxide scale. The oxide scale on unalloyed Fe3Al alloy had poor adherence. On the other hand, the result shows that, the oxidation rate decreased for titanium alloyed Fe3Al alloy, which has been explained by a change in the nature of the surface scale. Analysis of the oxidation product revealed that the presence of titanium as alloying elements change the nature of formed oxide scale and protect the bulk alloy from further oxidation.