Atom-probe study Ti Al based alloy

Abstract

Two phase α 2 +γ Ti Al based alloys have a better ductility than single phase alloys. Oxygen seems to have a key role with respect to the ductility properties of these alloys. This paper present an atom probe determination of oxygen concentration in α 2 and γ phases of two phase alloys and in single phase alloys. The nearly constant observed oxygen concentration in γ phase is considered as the oxygen maximum solubility in this phase (∼200 at. ppm). The oxygen excess which exists in normal alloys either leads to an oxide precipitation in single phase alloys or is absorbed in the α 2 phase of two phase alloys. The absence of oxides in two phase alloys could explain the better ductility of these alloys