STEM analysis of the local chemical composition in the nickel-based superalloy CMSX-2 after creep at high temperature

Journal Article · Thu Feb 01 04:00:00 EST 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/S0956-716X(95)00550-F· OSTI ID:201036

Buffiere, J Y ^[1]; Cheynet, M C; Ignat, M ^[2]

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1. GEMPPM INSA Lyon, Villeurbanne (France)
2. Domaine Univ., Saint Martin d`Heres (France)

High temperature creep of nickel-based superalloy single crystals is characterized by directional coalescence of the {gamma}{prime} reinforcing precipitates. The morphology of the coalesced structures depends on experimental parameters such as the sense and direction of the creep stress as well as on intrinsic parameters such as the sign of the misfit between matrix and precipitates. For single crystals of the commercial superalloy CMSX-2 submitted to <100> creep at 1,323K, the initially cuboidal {gamma}{prime} precipitates coalesce into platelets arranged perpendicular or parallel to the stress direction when the stress is in tension or in compression, respectively. So far, however, the evolution of the local chemical composition around dislocations had not been experimentally investigated in nickel-based superalloys.

• OSTI ID: 201036
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 3 Vol. 34; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL COMPOSITION
CREEP
DIFFUSION
DISLOCATIONS
MICROSTRUCTURE
MONOCRYSTALS
MORPHOLOGY
NICKEL BASE ALLOYS
PRECIPITATION
STRESSES