Investigation of the microstructure of aluminum and magnesium joints during diffusion welding

Keywords

diffusion welding, aluminum alloy, magnesium alloy, intermediate layer, microstructure, mechanical properties.

Cite as

Petrushynets L. V., Fedorchuk V. Ye., Mikhailov L. V., Falchenko Iu. V., Novomlynets O. O., and Voronin S. O. Investigation of the microstructure of aluminum and magnesium joints during diffusion welding. Physicochemical Mechanics of Materials. 2024. 60(4), 076-081.

https://doi.org/10.15407/pcmm2024.04.076

Abstract

The influence of temperature and chemical composition of intermediate layers on the for­mation of welded joints structure made of AMg2 aluminum and MA2-1 magnesium alloys is investigated. It is found that during thermo-deformation welding cycle at T = 400°C, a diffusion zone with a thickness of ~ 80 mm is formed bet­ween magnesium and aluminum alloys, with a microhardness in the central part of 2160 MPa, where the cracking occurs. To reduce the intensity of diffusion pro­cesses at the interface and prevent the formation of brittle intermetallic phases between the alloys, nickel or titanium foil with a thickness of 30 mm was used as a barrier layer. In the magnesium-aluminum joints obtained using a tita­nium foil layer, intermetallic layers do not form. Mechanical bending and tensile tests showed that the strongest mag­nesium-aluminum joints (s_B = 138–142 MPa) were obtai­ned when using titanium layers.

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