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le Graverend, J.-B.; Cormier, J.; Caron, P.; Kruch, S.; Gallerneau, F.; Mendez, J.
Materials science & engineering. A, Structural materials : properties, microstructure and processing, 03/2011, Letnik: 528, Številka: 6Journal Article
▶ Crystal plasticity calculations of the induced stress/strain fields in the vicinity of TCP-phases. ▶ Influence of TCP-phase on the local γ′ microstructure evolution. ▶ Influence of constitutive equations for TCP-phase. The influence of topologically close packed-phase (TCP-phase) precipitation on the γ/γ′ microstructure evolution of a single crystal superalloy has been studied. Four representative configurations of needle-shaped μ-phase particles observed in the MC2 alloy after creep deformation at 1050°C/160MPa have been selected. Finite element modeling was performed on the selected configurations using a crystal plasticity framework and a viscoplastic approach. The local calculated stress/strain fields in the vicinity of TCP-phase precipitates, especially stress concentration, allow an interpretation of the observed microstructural evolutions (γ′-precipitate orientation and thickness). Moreover, our numerical simulation brings a fruitful contribution to the understanding of the phenomenon often observed beyond needle-like μ-phase: the formation of a distorted γ/γ′ microstructure in lieu of the expected γ/γ′-rafted structure.
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