Effect of Thermal Treatment on Mechanical and Microstructural Properties of the Welded Joint of the Al-Mg-Li Alloy Obtained by Laser-Assisted Welding
A. M. Orishich1, A. G. Malikov1, E. V. Karpov1,2, N. A. Pavlov1, I. S. Mesenzova1
1Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia, 630090
2Lavrentyev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia, 630090
Keywords: лазерная сварка, алюминиево-литиевый сплав, закалка, искусственное старение, прочность, пластичность, микроструктура, фазовый состав, laser welding, Al-Li alloy, hardening, artificial aging, strength, plasticity, microstructure, phase composition
Abstract
Laser-assisted welding of the 1420 alloy of the Al-Mg-Li system is experimentally studied for the purpose of its optimization. Various regimes of thermal treatment of non-detachable joints obtained by means of laser welding are considered. Thermal treatment modes that allow significant enhancement of the welded joint density as compared to the as-received alloy are chosen. The ultimate normalized elongation of samples after aging is found to decrease by a factor of 3.
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