DUCTILE REINFORCEMENT TOUGHENING OF GAMMA-TIAL - EFFECTS OF DEBONDING AND DUCTILITY

The effects of reinforcement debonding and work hardening on ductile reinforcement toughening of γ-TiAl have been examined. Debonding has been varied by either the development of a brittle reaction product layer or by depositing a thin oxide coating between the reinforement and matrix. The role of work hardening has been explored by comparing a Nb reinforcement that exhibits high work hardening with a solution hardened TiNb alloy that exhibits negligible work hardening. It is demonstrated that a high work rupture is encouraged by extensive debonding when the reinforcement exhibits high work hardening. Conversely, debonding is not beneficial when the reinforcement exhibits low intrinsic ductility due to an absence of work hardening. © 1990.