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Metals and Materials International
Erschienen in: Metals and Materials International 10/2020

07.08.2019

Formation of Metastable Aluminides in Al–Sc–Ti (Zr, Hf) Cast Alloys

verfasst von: E. Popova, P. Kotenkov, A. Shubin, I. Gilev

Erschienen in: Metals and Materials International | Ausgabe 10/2020

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Abstract

The effect of the ternary alloys composition and overheating of their melts (at 100–370 K above the liquidus temperature) on the morphology and composition of aluminides in the Al–Sc–Ti, Al–Sc–Zr, Al–Sc–Hf systems were investigated. It was shown that during the crystallization of these melts under certain conditions, the primary precipitated phase are the complex aluminides Al3(ScxZr1−x), Al3(ScxTi1−x), Al3(ScxHf1−x) having a metastable cubic lattice with L12 structure, which matches the α-Al structural type. The variety of growth forms of aluminides is explained by a combination of a number of factors: the magnitude of overheating of the melt, the difference in the diffusion coefficients of transition metals, and the local concentration of transition metals in the respective growth zones.

Graphic Abstract

Vorheriger Artikel Carbide Formation and Matrix Strengthening by Nb Addition in Austenitic Stainless Cast Steels Used for Turbo-Charger-Housing Materials
Nächster Artikel Multi-Scale Mechanical Behaviour of a Highly Porous Alumina Based Foam

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Metadaten
Titel
Formation of Metastable Aluminides in Al–Sc–Ti (Zr, Hf) Cast Alloys
verfasst von
E. Popova
P. Kotenkov
A. Shubin
I. Gilev
Publikationsdatum
07.08.2019
Verlag
The Korean Institute of Metals and Materials
Erschienen in
Metals and Materials International / Ausgabe 10/2020
Print ISSN: 1598-9623
Elektronische ISSN: 2005-4149
DOI
https://doi.org/10.1007/s12540-019-00397-x

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