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2012 | 122 | 3 | 539-543
Article title

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

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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
Publisher

Year
Volume
122
Issue
3
Pages
539-543
Physical description
Dates
published
2012-09
Contributors
author
  • Institute for Metal Physics of the NAS of Ukraine, 36 Vernadsky Blvd., 03680 Kyiv, Ukraine
  • Institute for Metal Physics of the NAS of Ukraine, 36 Vernadsky Blvd., 03680 Kyiv, Ukraine
author
  • Institute for Metal Physics of the NAS of Ukraine, 36 Vernadsky Blvd., 03680 Kyiv, Ukraine
author
  • Institute for Metal Physics of the NAS of Ukraine, 36 Vernadsky Blvd., 03680 Kyiv, Ukraine
author
  • 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)
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv122z3p29kz
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