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• W66971837 abstract "At intermediate homologous temperatures, the yield stress of many materials is not sensitive to temperature or strain rate: there is a plateau in the graph of yield stress versus temperature. A widely-accepted explanation of the plateau is that an internal stress resists dislocation movement. This explanation is plausible and has an attractive generality. However, any explanation of the plateau must be compatible not only with the plateau itself, but also with its context: behavior of the yield stress at high and low temperatures, and microstructures before and after testing. In this broad context the internal stress hypothesis encounters some difficulties. The internal stress model has problems in explaining the constancy of the Cottrell-Stokes ratio in stage II work-hardening. The decline of the yield stress below the plateau level at high temperatures also conflicts with the internal stress model. And the magnitude of the plateau stress of annealed materials is too high to agree with the microstructures. There are other proposed explanations for the plateau, but none is consistent with all the constraining observations. The dipole-elongation hypothesis, neglected recently, does seem to merit further consideration. Microstructures of deformed materials support the basic assumption that jogged screw dislocations must draw out dipoles as they glide. At low temperatures dipole elongation would mandate a threshold stress rather than an additive component of the yield stress. If dipole initiation occurs when gliding screw dislocations encounter certain forest dislocations, this model is quantitatively consistent with plateau stresses of cubic metals, but not with those of hexagonal metals. Also, the hypothesis then explains the variation of the Cottrell-Stokes ratio in stage I hardening and its constancy in stage II. Microscopy supports the assumption of superjog formation at forest intersections. Such jogs could form by attractive-junction reactions. There is a serious disagreement between the dipole-elongation model and the occurrence of a stress asymptote smaller than the plateau stress in relaxation and strain-transient experiments. These observations indicate that forward dislocation motion is possible at stresses below the plateau level, in contradiction to the dipole-elongation hypothesis." @default.
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• W66971837 date "1979-01-01" @default.
• W66971837 modified "2023-09-23" @default.
• W66971837 title "Mechanism of Athermal Yielding at Medium Temperatures" @default.
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• W66971837 doi "https://doi.org/10.1016/b978-1-4832-8412-5.50021-7" @default.
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