Tensile deformation behavior of a new Ni-base superalloy at room temperature

摘要: Abstract The influence of γ′ precipitate size on the tensile deformation mechanism in a new Ni-base superalloy is investigated at room temperature. In order to achieve this aim, three model microstructures are obtained by changing aging time. After deformation, substructures characterized transmission electron microscopy. Experimental results reveal that plastic controlled primarily dislocations shearing precipitates all microstructures, and operative process evolves as function size. It found for fine microstructure (241 nm), both stacking fault anti-phase boundary operate simultaneously; case medium (446 nm), most sheared strongly coupled dislocations, leaving faulted loops within them; whereas coarse (597 nm), occurs movement small groups dislocations. Finally, based experimental observations, relationship between strength activation mechanisms discussed.