Microstructure and mechanical properties of a welded joint obtained by friction stir welding of thin copper and aluminum plates

Даниленко, В. Н.; Kiekkujina, Leila; Selivanov, Aleksey; Logachev, Y.V.; Atroshenko, Valeri; Mulyukov, R. R.

doi:10.22226/2410-3535-2022-2-106-110

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“…In some binary systems, intermetallic phases are formed during HPT deformation. Note that intermetallic compounds are formed during joining of dissimilar materials by the ARB [25] and FSW [26] methods. Annealing of the deformed samples enhances the phase formation [11,13,15 -17,19 -23], and affects the properties of the resulting metal matrix composites [15,17,19 -23].…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing on the structure and phase composition of Cu-Al composite produced by conventional and accumulative HPT

et al. 2022

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The paper presents the first results of the investigation of the effect of annealing on the evolution of microstructure and phase composition of a Cu-Al composite obtained by accumulative high pressure torsion (HPT). Cu-Al composites produced under 6 GPa in 10 revolutions at room temperature with conventional and accumulative HPT were annealed at 450°C for 15 min. Electron microscopy and energy dispersive spectrometry analysis showed that annealing enhances the solid-state reaction. In the sample after conventional HPT and post-deformation annealing, grayer contrast layers containing intermetallic compounds were formed at the copper-aluminum interface. The contrast on the microstructure images of the sample after accumulative HPT and post-deformation annealing is more uniform than after conventional HPT and annealing. In the sample, a more intense phase transformation occurred. This led to a noticeable increase in the volume fraction of the intermetallic compounds up to 5 -6 times. X-ray diffraction analysis indicates that in the annealed sample after accumulative HPT, alongside with initial copper, there is also a solid solution of aluminum in copper, which differs from copper with a crystal lattice parameter. Postdeformation annealing led to the formation of different quantity of intermetallic compounds in the studied samples.

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Section: Introductionmentioning

confidence: 99%