AUTOWAVE PLASTICITY IN AN ALUMINUM ALLOY WITH STRUCTURAL HETEROGENEITY
V.I. Danilov, D.V. Orlova, V.V. Gorbatenko
Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences (ISPMS SB RAS), Tomsk, Russia
Keywords: aluminum-magnesium alloy, deformation, elastoplastic transition, localized deformation front, switching, excitation, localized plasticity autowave
Abstract
The characteristics of the elastoplastic transition and subsequent hardening in the strain curve segment up to 4% deformation are investigated in homogeneous AMg5 alloy specimens and in specimens containing a friction stir weld. Depending on the strain rate, the elastoplastic transition is found to occur through the formation and propagation of localized plasticity autowaves of switching or excitation types. These autowaves form at stress concentrators, such as weld seam boundaries.
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