Powder metallurgy has been used to prepare FeAl powders with in situ created oxidation products. The aim of this study was to analyse the types of oxide formed as a function of sintering conditions. Highly oxidised powders have been used to give evidence of these transformations by X-ray diffraction. It has been shown that low temperature sintering (T<1200°C) results in the formation of FeAl 2 O 4 spinel, while higher sintering temperatures lead to its transformation into α-Al 2 O 3 and coarsening. An attempt, based on thermodynamic calculations, has been made to explain the formation of FeAl 2 O 4 spinel.