Evolution of interfacial dislocation network during anisothermal high-temperature creep of a nickel-based superalloy

The effect of thermal cycling creep on the dislocation networks at the γ/γ′ interfaces in the MC2 superalloy is investigated. Tensile creep tests were performed under thermal cycling and isothermal conditions at low stress (80 MPa) and high temperature (1150 °C). In these conditions γ′ rafts may dis...

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Bibliographic Details
Published in:Scripta materialia 2012-02, Vol.66 (3), p.143-146
Main Authors: Hantcherli, M., Pettinari-Sturmel, F., Viguier, B., Douin, J., Coujou, A.
Format: Article
Language:English
Subjects:
Chemical Sciences
Condensed Matter
Creep (materials)
Cristallography
Dislocations
Evolution
Interfacial dislocations
Material chemistry
Materials Science
MC2
Networks
Physics
Single-crystal superalloy
Superalloys
TEM
Tensile creep
Thermal cycling
Thermal cycling creep
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Summary:The effect of thermal cycling creep on the dislocation networks at the γ/γ′ interfaces in the MC2 superalloy is investigated. Tensile creep tests were performed under thermal cycling and isothermal conditions at low stress (80 MPa) and high temperature (1150 °C). In these conditions γ′ rafts may dissolve and reprecipitate during thermal cycling creep. The difference between the effects of isothermal and thermal cycling conditions on the γ/γ′ interface dislocation networks, characterized by transmission electron microscopy, is exposed, as well as their evolution during the cycle.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2011.10.022