کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1561074 | 1513926 | 2014 | 4 صفحه PDF | دانلود رایگان |

• The γ/γ′ diffusion mobility in a nickel-based superalloy is estimated.
• Microstructure evolution during creep is simulated by the phase-field method.
• Microstructure-dependent heterogeneous creep in the γ matrix phase is simulated.
• Directional coarsening of the γ′ precipitate (rafting) is reproduced.
• Simulated macroscopic creep response is consistent with previous experimental data.
The diffusion mobility associated with γ/γ′ interface migration (γ/γ′ diffusion mobility) in a nickel-based superalloy is estimated on the basis of the database of multicomponent atomic diffusion mobility. The estimation is based on the assumption that the phase equilibrium is reached during high-temperature creep, and that the γ/γ′ interface migration is controlled by atomic diffusion of Re, which exhibits the smallest atomic diffusion mobility in the alloy system under consideration. Utilization of the estimated γ/γ′ diffusion mobility enabled a three-dimensional phase-field simulation of microstructure-dependent heterogeneous creep in the γ matrix phase, directional coarsening of the γ′ precipitate (rafting), and macroscopic creep responses. The estimation of γ/γ′ diffusion mobility is assumed to be effective for quantitatively analyzing the rafting kinetics during high-temperature creep by the phase-field simulation.
Journal: Computational Materials Science - Volume 83, 15 February 2014, Pages 371–374