Abstract: Small amount addition of Ce to Fe_3Al results in a significant increase of room temperature strength of the alloy,and the combined addition of Ce and Cr improves both strength and ductility.The fracture mode of Fe_3Al containing Ce is a mixed one of approximately 70% transgranular cleavage and 30% intergranular failure.In the deformed specimens of binary Fe_3Al the dislocations observed are mainly single dislocations with =(1/4)a_0~'〈111〉. However,a number of superlattice dislocations can be observed in the deformed specimens of the alloys with Cr addition.

Key words: Fe_3Al, intermetallics, mechanical properties, superlattice dislocation