SOME IMPLICATIONS OF THE PARTICLE AND CLIMB GEOMETRY ON THE CLIMB RESISTANCE IN NICKEL-BASE SUPERALLOYS

摘要

Various dislocation climb models were developed for modelling the deformation processes in precipitation hardened alloys at elevated temperatures and low applied stresses. These models have been applied to alloy systems containing spherical, cubic and other precipitate shapes. However, in applying these models to alloys containing cubic precipitates, the particle orientation with respect to the slip plane and the slip geometry relevant to the nickel-base superalloys was not considered. In this paper we show that by taking into account the realistic climb and glide geometries, the value of the climb resistances considerably differ from those reported earlier on the basis of simplified geometries.