High-temperature deformation of the γ-Mg17Al12 complex metallic alloy

We report initial results on high-temperature deformation of a complex metallic alloy, the gamma -Mg17Al12 phase, isostructural with alpha -Mn. Although, like all complex metallic alloys, the gamma -Mg17Al12 phase is brittle at room temperature, a high deformability accompanied by a strong softening...

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Published in:Scripta materialia 2011-08, Vol.65 (3), p.253-256
Main Authors: Ragani, J., Donnadieu, P., Tassin, C., Blandin, J.J.
Format: Article
Language:English
Subjects:
Amorphous materials
Analogies
Brittleness
Deformation
Deformation mechanisms
Dislocation mobility
Quasicrystals
Softening
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description We report initial results on high-temperature deformation of a complex metallic alloy, the gamma -Mg17Al12 phase, isostructural with alpha -Mn. Although, like all complex metallic alloys, the gamma -Mg17Al12 phase is brittle at room temperature, a high deformability accompanied by a strong softening was observed above 573K (a arrow right 42/3 melting point). Transmission electron microscopy investigation indicates that dislocation climb should be involved in the deformation mechanisms. Similarities with the deformation behaviour of quasicrystals and metallic glasses are discussed.
doi_str_mv 10.1016/j.scriptamat.2011.04.022
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subjects Amorphous materials
Analogies
Brittleness
Deformation
Deformation mechanisms
Dislocation mobility
Quasicrystals
Softening
title High-temperature deformation of the γ-Mg17Al12 complex metallic alloy
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