| Title |
Effect of Ta Addition on Coarsening of γ' Particles in Nickel - Base Superalloy |
| Abstract |
The microstructure and coarsening kinetics were studied in modified MAR-M247 type nickel-base superalloy as a function of alloy composition and aging time at 982℃, In this study, Ta concentrations were changed to characterize the effects of the element on the microstructure and coarsening kinetics during the aging. The morphology of gamma prime particles was observed to be sensitive to alloy composition and gamma prime particle size. Gamma prime particles changed from spherical to cuboidal, or cuboidal to a plate-like morphology during the aging at 982℃. The coarsening kinetics of the alloys followed the t^⅓ dependence predicted by LSW theory. The addition of Ta decreased the coarsening rate of gamma prime. |