Effect of scandium on phase composition and hardening of Al–Ca–Si system casting aluminum alloys
https://doi.org/10.17073/0021-3438-2016-5-61-68
Abstract
The paper uses calculation (Thermo-Calc) and experimental (optical and electron scanning microscopy, electron microprobe analysis) methods and studies phase composition of the system Al–Ca–Si–Sc in the region of aluminum alloys. It studies the effect of annealing in the range of up to 550 °C on the structure and hardness of alloys containing 0,3 % of Sc. The study demonstrates that maximum hardening due to release of Al3Sc (L12) phase nanoparticles is achieved after annealing at temperatures of 300–350 °C in alloys falling within the phase region (Al) + Al4Ca + Al2Si2Ca ((Al) – solid aluminum-based solution). Scandium enters the (Al) composition in alloys of this region in full, and silicon concentration in such composition is minimal. On the other hand, hardening effect in alloys of the (Al) + (Si) + Al2Si2Ca phase region is near-zero. The study substantiates fundamental possibility of creating (Al) + Al4Ca + Al2Si2Ca eutectic-based cast alloys, which can be hardened without quenching.
Keywords
Al–Ca–Si–Sc system,
scandium,
EMPA,
phase composition,
calcium,
eutectic,
Al3Sc nanoparticles,
hardening
About the Authors
N. A. Belov
National University of Science and Technology «MISIS» (NUST «MISIS») (119049, Russia, Moscow, Leninskii pr., 4).
Russian Federation
Dr. Sci. (Eng.), professor of the Department of foundry technologies and material art working (FT&MAW), deputy director of the Engineering Centre «Foundry technologies and materials», National University of Science and Technology «MISIS» (NUST «MISIS»)
Russian Federation
Dr. Sci. (Eng.), professor of the Department of foundry technologies and material art working (FT&MAW), deputy director of the Engineering Centre «Foundry technologies and materials», National University of Science and Technology «MISIS» (NUST «MISIS»)
E. A. Naumova
Bauman Moscow State Technical University (105005, Russia, Moscow, 2-nd Bauman str., 5/1).
Russian Federation
Cand. Sci. (Eng.), associate prof., Department of materials, Bauman Moscow State Technical University
Russian Federation
Cand. Sci. (Eng.), associate prof., Department of materials, Bauman Moscow State Technical University
V. V. Doroshenko
National University of Science and Technology «MISIS» (NUST «MISIS») (119049, Russia, Moscow, Leninskii pr., 4).
Russian Federation
master's degree student, Department of FT&MAW, NUST «MISIS», engineer of the Engineering Centre «Foundry technologies and materials», NUST «MISIS».
Russian Federation
master's degree student, Department of FT&MAW, NUST «MISIS», engineer of the Engineering Centre «Foundry technologies and materials», NUST «MISIS».
T. A. Bazlova
National University of Science and Technology «MISIS» (NUST «MISIS») (119049, Russia, Moscow, Leninskii pr., 4).
Russian Federation
Cand. Sci. (Eng.), associate prof., Department of FT&MAW, NUST «MISIS».
Russian Federation
Cand. Sci. (Eng.), associate prof., Department of FT&MAW, NUST «MISIS».
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Review
For citations:
Belov N.A., Naumova E.A., Doroshenko V.V., Bazlova T.A. Effect of scandium on phase composition and hardening of Al–Ca–Si system casting aluminum alloys. Izvestiya. Non-Ferrous Metallurgy. 2016;(5):61-68. (In Russ.) https://doi.org/10.17073/0021-3438-2016-5-61-68
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