Abstract
Abstract The morphology of deformation-induced dislocations in polycrystalline Ni3 (Al,Cr) containing M23C6 precipitates has been investigated using transmission electron microscopy. Fine polyhedral precipitates of M23C6 were formed in the Ni3 (Al,Cr) matrix by aging at temperatures around 973 K after solution annealing at 1423 K. The aging behavior was investigated by microhardness measurements and the temperature dependence of the yield stress of Ni3 (Al,Cr) containing M23C6 precipitates was investigated by compression tests over the temperature range 298–1173 K. Typical Orowan loops were observed surrounding the M23C6 particles after deformation at temperatures below 973 K. At higher deformation temperatures, the Orowan loops disappeared and the morphology of dislocations at the particle-matrix interfaces suggested the existence of attractive interaction between dislocations and particles. The change in the modes of interaction between the dislocation and particles with increasing deformation temperature can be considered as a result of strain relaxation at the interface between the matrix and particles.
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