Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-171-C7-176
Precipitation mechanisms and subsequent hardening kinetics in the β-CEZ alloyY. COMBRES1, J. BECHET2 and A. VASSEL3
1 CEZUS, Centre de Recherches, avenue Paul Girod, 73400 Ugine, France
2 CNAM, Laboratoire de Métallurgie, 2 rue Conté, 75003 Paris, France
3 ONERA, Direction des Matériaux, BP. 72, 92322 Châtillon, France
The β-CEZ alloy : Ti-5%Al-2%Sn-4%Zr-4%Mo-2%Cr-l%Fe is a near β titanium alloy. Since its processing routes include heat treatment (consisting of solution treatment and ageing), it has been decided to study the influence of the β phase stability on α phase precipitation and hardening kinetics. Small sized specimens, coming from industrial heats, have been heat treated above and below the β transus, and then water quenched. Therefore, several degree of β stability are obtained. When it is increased (i.e. the solution treatment temperature is lowered), α or ω phases precipitations are delayed, as well as the hardening phenomena. Moreover, the ω stability domain is reduced. The mechanisms of α or ω precipitation are discussed, and related to the hardening kinetics.
© EDP Sciences 1993