Abstract
Using metals as an example, we have determined the dependences of the variation of dimensions and areas of fragments and grains on the parameters of large cold deformation. It is shown that in the case of a monotonic deformation to a true degree ɛ ∼ 3, low-angle grain boundaries are mainly formed, whereas in the case of nonmonotonic deformation that is performed with a constraint on the increment of the external surface, high-angle boundaries are mainly formed. The refined grains and subgrains acquire approximately equal minimum dimensions, which are determined by the specific dislocation-disclination features of the structure evolution. At the same time, it has been shown that the grain dimensions decrease substantially with a substantial increase in the ratio of the surface to the volume of the deformation zone. We revealed structural and mechanical factors demonstrating that the surface that is large as compared to the volume of the deformation zone plays an active role in the deformation process, providing generation of crystal-lattice defects necessary for grain refinement.
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Original Russian Text © F.Z. Utyashev, G.I. Raab, 2006, published in Fizika Metallov i Metallovedenie, 2006, Vol. 101, No. 3, pp. 311–322.
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Utyashev, F.Z., Raab, G.I. The area of the surfaces of fragments, grains, and the sample upon large cold deformations of metals and the effect of these surfaces and the surface of the deformation zone on structure refinement. Phys. Metals Metallogr. 101, 285–295 (2006). https://doi.org/10.1134/S0031918X06030136
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DOI: https://doi.org/10.1134/S0031918X06030136