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- Title
Decomposition Processes in the Anomalous Supersaturated Solid Solution of Binary and Ternary Aluminium Alloys Alloyed with Sc and Zr.
- Authors
Berezina, A. L.; Monastyrska, T. O.; Molebny, O. A.; Nosenko, V. K.; Kotko, A. V.
- Abstract
Decomposition of supersaturated solid solution of aluminium alloys alloyed with Sc and Zr have been studied in the work. The binary hypereutectic Al-Sc alloys, hyperperitectic Al-Zr alloys and ternary Al-Sc-Zr alloys were chosen. Alloys were obtained by the melt-spinning. Melts were quenched from temperatures of T = 1000 °C and T = 1400 °C. The crystallization of anomalously supersaturated solid solution (Tquen: = 1400 °C) or the crystallization with the formation of -fan- structure (Tquen: = 1000 °C) are possible. The decomposition of anomalously supersaturated solid solution is continuous, with the precipitation of nanosized spherical Al3X (X = Sc, Zr) particles. The loss of thermal stability of Al-Sc alloys is due to the loss of coherence of the strengthening Al3Sc phase. In Al-Zr alloys the loss of strength is due to the formation of a stable tetragonal DO23-ordered Al3Zr phase. After co-alloying of Al by Sc and Zr a bimodal grained structure was observed for the hypereutectic ternary alloy (Tquen: = 1400 °C). Nanosized grains of 50-60 nm were present on the boundaries of 1-2 μm large-sized grains. Transmission electron microscopy shows the formation of nanocomposite Al3Zr/Al3Sc particles. The formation of Al3Zr shell changes the nature of the interfacial fit of the particle with the matrix and slows down the decomposition during the coalescence.
- Subjects
ALUMINUM alloys; CRYSTALLIZATION; NANOCOMPOSITE materials; TRANSMISSION electron microscopy; ALLOYS
- Publication
Acta Physica Polonica: A, 2012, Vol 122, Issue 3, p539
- ISSN
0587-4246
- Publication type
Article
- DOI
10.12693/APhysPolA.122.539