Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-2105-C7-2110
Atom-probe study Ti Al based alloyA. HUGUET1, A. MENAND1, A. DENQUIN2 and S. NAKA2
1 Laboratoire de Microscopie Ionique, UA 808 du CNRS, Faculté des Sciences, BP. 118, 76134 Mont Saint Aignan, France
2 Office National d'Etudes et de Recherches Aerospatiales, BP. 72, 92355 Châtillon, France
Two phase α2+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 α2 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 [MATH] phase of two phase alloys. The absence of oxides in two phase alloys could explain the better ductility of these alloys.
© EDP Sciences 1993