Effect of interactions between elements on the diffusion of solutes in Ni X Y systems and γ′-coarsening in model Ni-based superalloys

Effect of Interactions Among Elements on Diffusion Process Associated with γ′ Coarsening in a Ni-Based Single-Crystal Superalloy

“…It is consistent with the experimental observation [22]. The migration of an atom depends on not only itself electronic structure but also its neighboring electronic atmosphere [21,23]. In other words, the mobility of an atom can be noticeably influenced by neighboring atoms when their interactions are strong [21].…”

“…Recently, the significant influences of elemental interactions on defect-solute complexes have been highlighted in some simple systems and model alloys [20][21][22][23][24]. Compared with the strain part induced by the difference in modulus and size misfits, the electronic part resulted from d-d electronic hybridization is much more efficient in interactions between dislocations as well as vacancies and alloying solutes, especially at high temperature [20,21]. It is consistent with the experimental observation [22].…”

“…The migration of an atom depends on not only itself electronic structure but also its neighboring electronic atmosphere [21,23]. In other words, the mobility of an atom can be noticeably influenced by neighboring atoms when their interactions are strong [21]. More importantly, the attractive electronic interactions between refractory element (Re, Ru, W or Ta) and Cr can significantly influence the diffusional flux of each other during microscopic cross-diffusion process [24].…”

“…Furthermore, the fundamental role of elemental interactions in migrations of γ-and γ′-partitioning elements during macroscopic crossdiffusion process is discussed qualitatively, with the help of the novel work in Ref. [21].…”

Mesoscopic quantitative chemical analyses using STEM-EDX in current and next generation polycrystalline Ni-based superalloys

“…It is also noted from Nb, have distinctively smaller diffusion coefficients by a factor of more than two orders of magnitude at the ageing temperature of 850⁰C [49][50][51]. W was reported to have an activation energy similar to or higher than that of Nb [52], hence W can be categorised in the group of Cr and Nb. Fγˊ precipitates after the Cγˊ was generated during furnace cooling after solution treatment.…”