Description of the New Eutectic Al-Ca-Cu System in the Aluminum Corner

Description of the New Eutectic Al-Ca-Cu System in the Aluminum Corner

The structure of the new ternary eutectic Al-Ca-Cu system considered as a replacement for the ternary eutectic system Al-Ce-Cu widely used for additive manufacturing has been studied using experimental techniques. The liquidus projection of the Al-Ca-Cu system in the aluminum corner has been suggest...

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Bibliographic Details
Published in:Metals (Basel ) Vol. 13; no. 4; p. 802
Main Authors: Akopyan, Torgom K., Belov, Nikolay A., Letyagin, Nikolay V., Cherkasov, Stanislav O., Nguen, Xuan D.
Format: Journal Article
Language:English
Published: Basel MDPI AG 01-04-2023
Subjects:
Al-Ca-Cu system
Alloys
Aluminum
Annealing
Composite structures
Copper
Crystallization
Equilibrium
Eutectics
Intermetallic compounds
intermetallics
Liquidus
Mechanical properties
microstructure
Phase composition
phase diagram
Software
Solid solutions
Solidification
Temperature
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Summary:The structure of the new ternary eutectic Al-Ca-Cu system considered as a replacement for the ternary eutectic system Al-Ce-Cu widely used for additive manufacturing has been studied using experimental techniques. The liquidus projection of the Al-Ca-Cu system in the aluminum corner has been suggested based on experiential studies of the microstructure and phase composition of model alloys. The suggested structure of the diagram has two quasi-binary sections: (Al)-Al27Ca3Cu7 and (Al)-Al8CaCu4 and three invariant eutectic transformations: L→(Al) + (Al,Cu)4Ca + Al27Ca3Cu7 (at 5.6 wt.% Ca, 4.5 wt.% Cu, 595 °C), L→(Al) + Al27Ca3Cu7 + Al8CaCu4 (at 2.2 wt.% Ca, 13.5 wt.% Cu, 594 °C) and L→(Al) + Al8CaCu4 + Al2Cu (at 0.5 wt.% Ca, 34 wt.% Cu, 544 °C). The limit solubility of copper in aluminum solid solution (Al) at 530 °C reaches ~5.1 wt.% in the ternary phase field (Al) + Al8CaCu4 + Al2Cu and drops to ~2.4 wt.% in the (Al) + Al8CaCu4 + Al27Ca3Cu7 ternary phase field. For the example of the model ternary hypoeutectic alloys with a predominant content of the eutectic (Al,Cu)4Ca phase, it has been shown that the system is promising for designing new eutectic-type alloys with a natural composite structure.
ISSN:2075-4701
2075-4701
DOI:10.3390/met13040802