The flow stress of Nickel-based γ/γ′ superalloys containing up to 73 vol.% of Ni3Al precipitates was calculated by dislocation dynamics simulations of a dislocation pair gliding on {111} planes, for temperatures up to 1000K. It was calculated for different composition-related parameters (friction stress and antiphase boundary energy), as well as for different microstructural parameters (channel width, precipitate volume fraction and the geometry of the intersection of the {111} glide plane with the precipitate). The emphasis was on the bowing-assisted cutting regime, which was the prevalent deformation mechanism observed in the simulations.

Dislocation Dynamics Simulations of Precipitation Hardening in Ni-Based Superalloys with High γ′ Volume Fraction. A.Vattré, B.Devincre, A.Roos: Intermetallics, 2009, 17[12], 988-94