Decomposition Processes in the Anomalous Supersaturated Solid Solution of Binary and Ternary Aluminium Alloys Alloyed with~Sc and~Zr

• Authors: A. Berezina , T. Monastyrska , O. Molebny , V. Nosenko , A. Kotko
• Languages of publication: EN

Abstracts

EN

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 = 1000C and T = 1400°C. The crystallization of anomalously supersaturated solid solution (T_{quen.} = 1400°C) or the crystallization with the formation of "fan" structure (T_{quen.} = 1000°C) are possible. The decomposition of anomalously supersaturated solid solution is continuous, with the precipitation of nanosized spherical Al_3X (X = Sc, Zr) particles. The loss of thermal stability of Al-Sc alloys is due to the loss of coherence of the strengthening Al_3Sc phase. In Al-Zr alloys the loss of strength is due to the formation of a stable tetragonal DO_{23}-ordered Al_3Zr phase. After co-alloying of Al by Sc and Zr a bimodal grained structure was observed for the hypereutectic ternary alloy (T_{quen.} = 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 Al_3Zr/Al_3Sc particles. The formation of Al_3Zr shell changes the nature of the interfacial fit of the particle with the matrix and slows down the decomposition during the coalescence.

Keywords

EN

64.70.dg; 81.07.Bc; 81.10.Fq

Discipline

• 64.70.dg: Crystallization of specific substances
• 81.10.Fq: Growth from melts; zone melting and refining
• 81.07.Bc: Nanocrystalline materials

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 122
• Issue: 3
• Pages: 539-543

Dates

published

2012-09

Contributors

author

A. Berezina

• Institute for Metal Physics of the NAS of Ukraine, 36 Vernadsky Blvd., 03680 Kyiv, Ukraine

author

T. Monastyrska

• Institute for Metal Physics of the NAS of Ukraine, 36 Vernadsky Blvd., 03680 Kyiv, Ukraine

author

O. Molebny

• Institute for Metal Physics of the NAS of Ukraine, 36 Vernadsky Blvd., 03680 Kyiv, Ukraine

author

V. Nosenko

• Institute for Metal Physics of the NAS of Ukraine, 36 Vernadsky Blvd., 03680 Kyiv, Ukraine

author

A. Kotko

• Institute for Metal Physics of the NAS of Ukraine, 36 Vernadsky Blvd., 03680 Kyiv, Ukraine

References

• [1] A.L. Berezina, U. Schmidt, T.A. Monastyrska, Mater. Sci. Forum 396-402, 763 (2002)
• [2] A.L. Berezina, K.V. Chuistov, T.A. Monastyrska, Metallofiz. Noveishie Tekhnol. 25, 1001 (2003)
• [3] A.L. Berezina, E.A. Segida, V.K. Nosenko, Electron Microsc. Strength Mater. 14, 57 (2007)
• [4] A.L. Berezina, E.A. Segida, N.N. Budarina, A.V. Kotko, G.S. Mogilnyi, Metallofiz. Noveishie Tekhnol. 30, 647 (2008)

Identifiers

DOI

10.12693/APhysPolA.122.539