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- W30003704 abstract "Deformation of polycrystals is treated as the average behavior of an agglomerate of individual crystallites and their interaction across the grain boundaries. After considering the effect of grain boundaries on yield, in a rather general way the similarities between stress strain curves of single crystals and polycrystals are discussed, including the implication for commonly used stress strain relationships. Since - as known from polyslip in single crystals - the polycrystal curve consists of two stages (II and III) which are differently affected by deformation temperature, these two stages are treated separately. The range of athermal hardening (stage II) is described quantitatively by incorporating the processes of dislocation storage near the grain boundary into the well established stage II theories of single crystals. It is concluded from this discussion, that the influence of grain size on yielding and on work hardening at low strains is phenomenologically well explored and rather well understood theoretically. The range of temperature dependent work hardening (stage III) is interpreted as being the stage where the dislocation structure evolves towards a well defined cell structure, which approaches a steady state pattern as strain proceeds. The influence of temperature and strain rate on steady state appears to be the same for single crystals (deformed in polyslip) and polycrystals in the normal range of grain sizes. Although the differences between different materials can be related to the values of certain material parameters, understanding of stage III suffers from our ignorance of the basic dislocation mechanisms which control cell formation. In the last part effects of very large strains are shortly considered. Texture development is taken as an example how information about details of the deformation of the grains can be deduced from a comparison of experimentally obtained and of theoretically derived pole figures. Eventually it is discussed that at very large strains new effects appear, which are beyond the scope of the common theoretical concepts of work hardening and plastic flow." @default.
- W30003704 created "2016-06-24" @default.
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- W30003704 date "1979-01-01" @default.
- W30003704 modified "2023-09-26" @default.
- W30003704 title "Deformation of Polycrystals" @default.
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- W30003704 doi "https://doi.org/10.1016/b978-1-4832-8412-5.50246-0" @default.
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