Institute of Strength Physics and Materials Science (ISPMS) SB RAS (Tomsk, Russia)

D. V. Orlova, Researcher, Candidate of Physical and Mathematical Sciences, dvo@ispms.ru
V. I. Danilov, Chief Researcher, Doctor of Physical and Mathematical Sciences, Professor, dvi@ispms.ru
V. V. Gorbatenko, Senior Researcher, Candidate of Physical and Mathematical Sciences, gvv@ispms.ru
G. V. Shlyakhova, Researcher, Candidate of Technical Sciences, shgv@ispms.ru

The results of a study on the effect of structural heterogeneity in the form of a friction stir welded (FSW) joint on the patterns of localized plastic flow and fracture in D16 (Al – Cu – Mg) alloy are presented. It is known that plastic strain localization in metals has an autowave nature and develops from the elastic-plastic transition to fracture. However, the mechanisms of autowave flow in structurally heterogeneous materials, such as welded joints, remain insufficiently studied, particularly for heat-treatable aluminum alloys. It has been established that the FSW parameters used result in the formation of a coarse-grained recrystallized structure in the stir zone. This reduces the structural strength of the joint compared with the base metal. Subsequent quenching does not eliminate this deficiency. It has been found that the interface between the weld joint and the base metal becomes an active center that modifies the autowave process: when crossing the interface, the pattern of motion of the localized plasticity fronts changes. In addition, heat treatment induces the Portevin-Le Chatelier effect, which is associated with precipitation from a metastable solid solution formed as a result of quenching. This effect is absent in the initial state, while serrated deformation has occurred specifically at the interface. The results obtained extend the autowave concept of plasticity to heterogeneous welded joints.
The work was carried out within the framework of the state assignment of the Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, topic No. FWRW-2026-0006.

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