|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||The Effect of γ Particles in γʹ Precipitates on the Mechanical Properties in Ni-Al-Ti Superalloys
||Markus Kolb, Steffen Neumeier, Mathias Göken
|On-Site Speaker (Planned)
Recent publications have shown that during recrystallization or thermal exposure at low temperatures small disordered precipitates can be formed in the ordered γʹ phase. This current work aims to investigate the effect of γ precipitates within the γʹ phase on the mechanical properties. The influence of the γ precipitates in the γʹ phase has been investigated by nanoindentation and micropillar compression testing at ambient and elevated temperatures of a ternary Ni86.1Al8.5Ti5.4 model alloy. The hardness as well as the critical resolved shear stress is found to increase up to an optimal γ precipitate size. Complementary investigations in the TEM and atomistic simulations were performed to clarify the underlying mechanism responsible for the strengthening effect induced by γ precipitates.
Overall it was found, that the γʹ phase can be strengthened by unordered γ precipitates in the ternary Ni-Al-Ti superalloys.
||Planned: Supplemental Proceedings volume