LOW ENERGY–HIGH FLUX NITROGEN IMPLANTATION OF AN OXIDEDISPERSION- STRENGTHENED FeAl 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 oxygen-dispersion-strengthened FeAl Grade 3 intermetallic alloy has undergone a low energy-high flux nitridation treatment. The uniform implanted layer is accompanied by a random distribution of protrusions anchored by yttria particles. Electron microscopy studies reveal the presence of thin layer of AlN embedded in a matrix of FeAl, which mainly accounts for the dramatic increase in surface microhardness. After nitridation, fragmentation of the outermost FeAl grains occurs through which countercurrent diffusion of nitrogen and aluminium seems to proceed. As a result, segregation of a-Fe is observed at the nitrided layer / substrate interface.

Mots clés: Ion implantation; Nitrogen; Alloys; Transmission electron microscopy (TEM)

Domaines: Matériaux

Fernando Pedraza, Jean-Luc Grosseau-Poussard, J.F Dinhut. LOW ENERGY–HIGH FLUX NITROGEN IMPLANTATION OF AN OXIDEDISPERSION- STRENGTHENED FeAl INTERMETALLIC ALLOY. Thin Solid Films, 2004, 467, pp.140-145. ⟨10.1016/j.tsf.2004.04.054⟩. ⟨hal-00512809⟩