National University of Science and Technology MISIS (Moscow, Russia)

N. A. Belov, Doctor of Technical Sciences, Chief Scientist of Metal Forming Department, nikolay-belov.yandex.ru
A. V. Fomin, Candidate of Technical Sciences, Engineer of Metal Forming Department, fominmisis84@mail.ru
S. O. Cherkasov, Candidate of Technical Sciences, Senior Teacher of Metal Forming Department, ch3rkasov@gmail.com
K. A. Kurbanov, Student of Metal Forming Department, koma85@inbox.ru

A comparative analysis of the microstructure and mechanical properties of extruded bars produced from chips by solid-phase consolidation was carried out using two aluminum alloys of different alloying systems: the AD31 alloy and the experimental “Calmar” alloy based on the Al – Ca – Mn system. Chips were produced from ingots by turning with equal cutting conditions for both alloys. The dimensions of the chips (both for AD31 and “Calmar” alloys) were: thickness 1–6 mm, length 2–15 mm, height 2–5 mm. It was shown that under identical briquetting conditions, the calculated density of briquettes produced from the “Calmar” alloy is closer to the calculated density of the ingot compared to the AD31 alloy: 89.5% vs. 85.2%. It was established that direct extrusion of briquettes makes it possible to obtain defect-free bars with high strength and ductility, which are not inferior to those produced from ingots under similar conditions. For the “Calmar” alloy, the UTS is 152–179 MPa and the elongation is 15.2–18.2%. The microstructure of bars produced from chips is characterized by a more favorable morphology of eutectic phases and their more uniform distribution compared to bars produced from ingots. This effect is especially pronounced in the experimental alloy, in which the volume fraction of such phases reaches about 10% (compared to about 2% in the AD31 alloy). It was shown that the experimental “Calmar” alloy exhibits superior mechanical properties compared to the AD31 alloy. This indicates that eutectic-type alloys are more promising for solid-phase consolidation than alloys with a low content of secondary phases.

This study was carried out with the financial support of the RSF grant No 25-19-00002 (ingots manufacturing, SEM, mechanical properties) and by the Moscow Polytechnic University within the framework of the grant named after Pyotr Kapitsa (chips, briquettes and extruded bars manufacturing).

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