Stability of γ′ multimodal microstructure in a Ni-based powder metallurgy superalloy
- 30 Downloads
Multimodal size distribution of γ′ phase was obtained in a slow-cooling experiment following supersolvus solution treatment (1191°C). The morphology of the secondary γ′ particles exhibited splitting and protrusion instabilities. In the subsequent aging process (815°C), reverse coarsening was observed, i.e., the average precipitate size decreased with increasing aging time. Reverse coarsening slows the coarsening rate of the precipitates, increases the hardness of the alloy, and greatly improves the morphological stability of the γ′ phase.
KeywordsNickel alloys γ′ phase multimodal size distribution microstructure stability
Unable to display preview. Download preview PDF.
- 13.Unocic R R, Sarosi P M, Viswanathan G B, et al. The creep deformation mechanisms of nickel base superalloy René104. Microsc Microanal, 2005, 11: 1874–1875Google Scholar