EVOLUTION OF OXIDE SCALES ON FeAl GRADE 3 INTERMETALLIC ALLOY

Fernando Pedraza (1) , Jean-Luc Grosseau-Poussard (1) , J.F Dinhut (1)

1 LEMMA - Laboratoire d'Etude des Matériaux en Milieux Agressifs

The ODS FeAl Grade 3 intermetallic alloy have been shown to develop a structured oxide scale upon isothermal oxidation between 850 and 950º C for 24 h. Transmission electron microscopy studies have revealed a top nanoequiaxed alumina, central alumina and bottom Fe-Al spinel. At 1000º C, the spinel phase no longer forms but a columnar alumina layer topped up with a nanoequiaxed structure. The role of yttria is negligible at lower temperatures whereas some segregation at the scale/substrate interface and precipitation of YAlO3 is observed at 1000º C.

Mots clés: Iron aluminides (based on FeAl); oxidation

Domaines: Matériaux

Fernando Pedraza, Jean-Luc Grosseau-Poussard, J.F Dinhut. EVOLUTION OF OXIDE SCALES ON FeAl GRADE 3 INTERMETALLIC ALLOY. Intermetallics, 2005, 13, pp.27-33. ⟨10.1016/j.intermet.2004.04.042⟩. ⟨hal-00512816⟩