Formation of annealing twins during primary recrystallization of two low stacking fault energy Ni-based alloys - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Materials Science Année : 2015

Formation of annealing twins during primary recrystallization of two low stacking fault energy Ni-based alloys

W Wang
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S Lartigue-Korinek
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F Brisset
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A L Helbert
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J Bourgon

Résumé

First stages of recrystallization are analyzed in low stacking fault energy nickel alloys cold rolled and subsequently annealed at 700°C for 6 minutes. These alloys are envisaged as candidate materials for the heat exchanger of VHTR (Very High Temperature Reactor) that works at 1000°C. First recrystallized grains show evidence of extensive twinning that is studied by Transmission Electron Microscopy. Specific twinning features such as five-fold twin and microtwins bordered by partial dislocations are revealed. Twin density increases with increasing amounts of prior deformation before annealing. The local crystal orientations are determined at a nanometer scale. It is shown directly that when twinning occurs, the recrystallized area beyond the twin has a lower stored deformation energy. Thus recrystallization and the associate twinning induce a decrease in the total stored deformation energy.

Domaines

Matériaux
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Dates et versions

hal-03301329 , version 1 (27-07-2021)

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  • HAL Id : hal-03301329 , version 1

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W Wang, S Lartigue-Korinek, F Brisset, A L Helbert, J Bourgon, et al.. Formation of annealing twins during primary recrystallization of two low stacking fault energy Ni-based alloys. Journal of Materials Science, 2015. ⟨hal-03301329⟩
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