Abstract
A theoretical model is proposed to describe the nucleation of deformation twins at grain boundaries in nanocrystalline materials under the action of an applied stress and the stress field of a dipole of junction or grain-boundary wedge disclinations. The model is used to consider pure nanocrystalline aluminum and copper with an average grain size of about 30 nm. The conditions of barrier-free twinning-dislocation nucleation are studied. These conditions are shown to be realistic for the metals under study. As the twin-plate thickness increases, one observes two stages of local hardening and an intermediate stage of local flow of a nanocrystalline metal on the scale of one nanograin. In all stages, the critical stress increases with decreasing disclination-dipole strength. The equilibrium thickness and shape of the twin plate are analyzed and found to agree well with the well-known results of experimental observations.
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Original Russian Text © M.Yu. Gutkin, I.A. Ovid’ko, N.V. Skiba, 2007, published in Fizika Tverdogo Tela, 2007, Vol. 49, No. 5, pp. 830–838.
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Gutkin, M.Y., Ovid’ko, I.A. & Skiba, N.V. Mechanism of deformation-twin formation in nanocrystalline metals. Phys. Solid State 49, 874–882 (2007). https://doi.org/10.1134/S1063783407050125
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DOI: https://doi.org/10.1134/S1063783407050125