Partitioning and diffusion of transition metal solutes in ternary model Ni-based single crystal superalloys

• Published in: Materials & design 2017-09, Vol.130, p.157-165
• Main Authors: Liu, Shaohua, Wen, Minru, Li, Zi, Liu, Wenqing, Yan, Ping, Wang, Chongyu
• Format: Article
• Language: English
• Subjects: Atom probe tomography; Coarsening; Diffusion rate; First-principles; Nickel-based superalloy; Partitioning coefficient
• ISSN: 0264-1275; 1873-4197
• DOI: 10.1016/j.matdes.2017.05.032

Partitioning and diffusion of transition metal solutes can significantly affect the coarsening rate of γ′ precipitates in Ni-based single crystal superalloys. Using first-principles density-functional calculations and atom probe tomography, we investigated the partitioning coefficient and diffusion rate of 3d (TiNi), 4d (ZrPd), and 5d (HfPt) transition metal solutes. For ternary model Ni-based single crystal superalloys, the 3d solutes (except Ti) partition to the matrix phase, whereas 4d and 5d solutes (except Ru, Rh, and Ir) prefer γ′ precipitates. The existing atom probe tomography results are consistent with the calculation results. Across the periodic table, middle-row elements have a higher (lower) diffusion activation energy (diffusion rate) than early and late row elements. The band-filling effect that is coupled with electronic structure analysis can explain the parabolic behavior of energetics that involves bond breaking. To minimize the coarsening rate, we have screened alloying elements that both have a low diffusion rate in the γ matrix and partition to the γ′ phase. These alloying elements will suppress the coarsening behavior of the precipitates and are expected to contribute to the stability of precipitates at elevated temperature. [Display omitted] •For ternary alloys, almost all 3d solutes partition to the matrix, whereas most 4d and 5d solutes prefer γ′.•Across the periodic table, middle-row elements have a lower diffusion rate than early and late row elements.•The physical and chemical effects influencing energies can explain the site and diffusion trends well.•Elements that both have a low diffusivity in γ and partition to γ′ would suppress the coarsening of precipitates.