Partitioning and diffusion of transition metal solutes in ternary model Ni-based single crystal superalloys
| Autor: | Chong-Yu Wang, Zi Li, Minru Wen, Shaohua Liu, Wen-Qing Liu, Ping Yan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Diffusion Thermodynamics 02 engineering and technology Atom probe Activation energy 021001 nanoscience & nanotechnology 01 natural sciences law.invention Partition coefficient Superalloy Crystallography Transition metal Mechanics of Materials law 0103 physical sciences lcsh:TA401-492 General Materials Science lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology Ternary operation Single crystal |
| Zdroj: | Materials & Design, Vol 130, Iss, Pp 157-165 (2017) |
| ISSN: | 0264-1275 |
| Popis: | 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. Keywords: Nickel-based superalloy, Partitioning coefficient, Diffusion rate, Coarsening, First-principles, Atom probe tomography |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect