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

다국어 초록 (Multilingual 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 wasshown that during the crystallization of these melts under certain conditions, the primary precipitated phase are the complexaluminides Al3(ScxZr1−x), Al3(ScxTi1−x), Al3(ScxHf1−x) having a metastable cubic lattice with L12 structure, which matchesthe 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 concentrationof transition metals in the respective growth zones.

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