Segregation at stacking faults within the γ′ phase of two Ni-base superalloys following intermediate temperature creep

Viswanathan, G.B. and Shi, R. and Genc, A. and Vorontsov, V.A. and Kovarik, L. and Rae, C.M.F and Mills, M.J. (2015) Segregation at stacking faults within the γ′ phase of two Ni-base superalloys following intermediate temperature creep. Scripta Materialia, 94. pp. 5-8. ISSN 1359-6462 (https://doi.org/10.1016/j.scriptamat.2014.06.032)

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Abstract

Using state-of-the-art energy dispersive spectroscopy, it has been established for the first time that there exists significant compositional variation (enrichment of Co and Cr and deficiency of Ni and Al) associated with superlattice intrinsic stacking faults created in the ordered γ′ precipitates following intermediate temperature deformation of two commercial superalloys. The results indicate that long range diffusion of these elements is intimately involved in the precipitate shearing process and is therefore closely linked to the time-dependent deformation of the alloys.

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