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- W1974468483 abstract "The shearing mechanisms of cuboidal γ′ precipitates by single dislocations in a nickel-base superalloy are investigated. The possibility of nucleation of a Shockley loop in the incipient antiphase boundary left behind the incoming dislocation is discussed. It is shown that this nucleation is thermally activated. The saddle point energy depends on the Peach-Köhler force acting on the loop, thus selecting the Burgers vector of the nucleated loop and thereafter the intrinsic or extrinsic nature of the resulting superlattice stacking fault. This approach generalizes the previous one by Condat and Décamps to any orientation of the applied stress. The implications on tension-compression asymmetry are discussed. Les mécanismes de cisaillement des précipités cuboïdaux γ′ par des dislocations de matrice sont étudiés dans un superalliage base Nickel. La possibilité de germination d'une boucle de Shockley sur la paroi d'antiphase naissante traǐnée par la dislocation de matrice incidente est examinée. On montre que cette germination est thermiquement activée. L'énergie de col dépend de la force de Peach et Köhler sur la boucle, ce qui sélectionne le vecteur de Burgers de la boucle créée, et donc la nature intrinsèque ou extrinsèque du défaut d'empilement de superréseau qui en résulte. Cette approche est une généralisation de l'approche antérieure de Condat et Décamps à des orientations quelconques de la contrainte appliquée. Les implications du modèle sur l'asymétrie tension-compression sont discutées." @default.
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- W1974468483 date "1993-06-16" @default.
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- W1974468483 title "On the Mechanisms of Formation of Superlattice Stacking Faults in L12 Precipitates Embedded in a F.C.C. Matrix" @default.
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- W1974468483 doi "https://doi.org/10.1002/pssa.2211370214" @default.
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