Abstract
The problem of plastic shear propagation in conditions of high crystal lattice curvature has been researched theoretically and experimentally on the basis of the gauge theory. It has been shown that in conditions of high crystal lattice curvature, the flows of deformation defects reveal plastic distortion, vorticity of plastic shears, and the possibility of their non-crystallographic propagation by a shear banding. Experimental research on the mechanical behavior of the commercially pure Ti samples under alternating bending demonstrated the strong influence of their structural state on the development of high crystal lattice curvature and shear banding. The high crystal lattice curvature under a cyclic loading appears in the hydrogenated surface layers, where shear banding and microporosity develop and fatigue life is greatly reduced. High crystal lattice curvature in surface layer of Ti samples produced by ultrasonic processing determines the fourfold increase of Ti fatigue life. The translation-rotation deformation against developed grain boundary sliding in high-purity A999 Al polycrystals under creep and in A999 Al foils glued on commercial A7 Al plates under alternate bending was studied. The stage of steady-state creep provides intragranular sliding in the material mainly by dislocation mechanisms. The stage of tertiary creep causes multiscale fragmentation, non-crystallographic sliding, and fracture. Under alternate bending, the Al foils are involved in rotations by dislocation mechanisms only up to a strain of ~50%, and as they become highly corrugated, shear bands propagate in them. The observed shear banding provides the generation of elastoplastic rotations in zones of high lattice curvature.
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Panin, V.E., Egorushkin, V.E., Elsukova, T.F., Surikova, N.S., Pochivalov, Y.I., Panin, A.V. (2018). Multiscale Translation-Rotation Plastic Flow in Polycrystals. In: Schmauder, S., Chen, CS., Chawla, K., Chawla, N., Chen, W., Kagawa, Y. (eds) Handbook of Mechanics of Materials. Springer, Singapore. https://doi.org/10.1007/978-981-10-6855-3_77-1
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