High-temperature deformation of the gamma-Mg(17)Al(12) complex metallic alloy
Résumé
We report initial results on high-temperature deformation of a complex metallic alloy, the gamma-Mg(17)Al(12) phase, isostructural with alpha-Mn. Although, like all complex metallic alloys, the gamma-Mg(17)Al(12), phase is brittle at room temperature, a high deformability accompanied by a strong softening was observed above 573 K (similar to 2/3melting 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. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.