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Oxidation of β‐FeAl and Fe‐Al alloys
Author(s) -
Rommerskirchen I.,
Eltester B.,
Grabke H. J.
Publication year - 1996
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19960471109
Subject(s) - feal , intermetallic , nial , materials science , oxide , thermogravimetry , partial pressure , atmospheric temperature range , phase (matter) , aluminium , metallurgy , metal , kinetics , metastability , oxygen , analytical chemistry (journal) , thermodynamics , chemistry , inorganic chemistry , alloy , physics , organic chemistry , chromatography , quantum mechanics
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.