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- W2040567179 abstract "Abstract According to the observation, that hot-working leads to the formation of cell walls (or subgrain boundaries), a model is proposed describing the deformation of single crystals in terms of an evolution of two dislocation populations (edge and screw dislocations) and the vacancy concentration by a set of coupled nonlinear ordinary differential equations. These equations are strictly related to the underlying physical processes of substructure formation such as accumulation of dislocations in the walls and partial annihilation of screw dislocations by cross slip or diffusion-induced climbing of edge dislocations. Analytical examination of the model shows the existence of clearly distinguished deformation regimes with either stable or instable behaviour. The transition between them is particularly influenced by the stacking fault energy (SFE): SFEs above a critical value lead to stable dislocation dynamics which corresponds to pure dynamic recovery, while lower SFEs give rise to instabilities which may be related to the formation of grain boundaries and, consequently, to dynamic recrystallization. In order to illustrate the situation, results of numerical studies are presented." @default.
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- W2040567179 date "1994-11-01" @default.
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- W2040567179 title "Modelling the hot-working behaviour of metals" @default.
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- W2040567179 doi "https://doi.org/10.1016/0927-0256(94)90136-8" @default.
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