Oxidation of β-FeAl and Fe-Al alloys

✍ Scribed by I. Rommerskirchen; B. Eltester; H. J. Grabke

• Book ID: 102937191
• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: German
• Weight: 913 KB
• Volume: 47
• Category: Article
• ISSN: 0947-5117
• DOI: 10.1002/maco.19960471109

✦ Synopsis

Abstract

The oxidation kinetics of the intermetallic phase β‐FeAl has been investigated by means of thermogravimetry in the temperature range 800–1100°C. At temperatures higher than 900°C the initially formed metastable aluminium oxides are converted to adherent and slow growing α‐Al~2~O~3~ scales. The rate of conversion accelerates with increasing temperature. The parabolic rate constants k~p~ are comparable with those of β‐NiAl.

The influence of the Al content on the oxidation behaviour was investigated in exposure experiments at low oxygen partial pressures for samples with 5 to 48 at.% Al. The oxide morphology changes only with the oxidation temperature, neither variations in Al content nor in O~2~‐pressure has any influence. In samples with higher Al content cavities are formed beneath the oxide scale in the metallic matrix.