Scientific journal
Scientific Review. Technical science
ISSN 2500-0799
ПИ №ФС77-57440

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DEFORMATION BEHAVIOR OF ULTRAIFINE GRAINED ALUMINUM ALLOY AT ROOM TEMPERATURE

Mishin I.P. 1
1 Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences
The regularities of the deformation behavior of ultrafine-grained aluminum alloy produced by severe plastic deformation under tension at room temperature are researched. It is shown that in comparison with ultrafine-grained aluminum (99.99%) with comparable characteristics of ultrafine-grained structure (average grain size, dislocation density) alloy of Al-Mg-Li system with the addition of zirconium and scandium is significantly different in character deformation behavior at room temperature. This is expressed in increasing of extentention of strain hardening stage and the corresponding increase in the magnitude of uniform elongation in heterophase alloy compared with single-phase metal. The reason for this are evolved in volume and at grin boundaries of the alloy fine particles of intermetallic phases as well as S-phase particles, which hinder grain boundary sliding and the localization of plastic deformation.