Abstract:
Spontaneous self-localization of deformation in deformable metals and alloys is a negative phenomenon that worsens their operational physicochemical, strength, and anti-corrosion properties and can cause sudden destruction. This problem is especially important for high-tech aluminum alloys, in which localized Chernov–Luders deformation bands and Portevin – Le Chatelier bands are observed. In this work, using high-speed video recording and computer processing of digital images, we study the dynamics and morphology of deformation bands initiated by stress concentrators of various natures in an aluminum-magnesium alloy deformed under uniaxial tension conditions. It has been established that even corrosion pits, small scratches and indenter imprints are capable of initiating the nucleation and propagation of macrolocalized deformation bands into the material volume, the interaction of which causes the development of a main crack. Acknowledgements The work is supported by the Russian Science Foundation (project No. 23-79-01119) with the use of equipment of the Center of Collective Use of Tambov State University.
Keywords:methane portevin – le chatelier effect, stress concentrator, deformation band.
