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

Journal Article · Thu Jan 01 00:00:00 EST 2015 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2014.06.032· OSTI ID:1166817

Viswanathan, G. B. ^[1]; Shi, R. ^[1]; Genc, A. ^[2]; Vorontsov, V. A. ^[3]; Kovarik, L. ^[4]; Rae, C. M. F. ^[3]; Mills, M. J. ^[1]

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1. The Ohio State Univ., Columbus, OH (United States)
2. FEI Company, Hillsboro, OR (United States)
3. Univ. of Cambridge (United Kingdom)
4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

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.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1166817
• Report Number(s): PNNL-SA-105000; KP1704020
• Journal Information: Scripta Materialia, Vol. 94, Issue C; ISSN 1359-6462
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE