The aging structures of Al-Mg-Si alloys have been studied in detail by means of transmission electron microscopy, paying attention to the fact that cube-shaped precipitates are sometimes formed in this alloy system.The results indicate that the cube-shaped precipitates appear only in the (α+Mg2Si) two-phase alloys at aging temperatures and not in the (α+Mg2Si+Si) three-phase alloys, and the cube-shaped phases are metastable phases appearing at an intermediate stage between the rod-shaped and plate-shaped precipitates. The selected area diffraction has revealed that the phases are of the fcc structure with a lattice parameter of a=0.633±0.005 nm and have the relationship with the matrix.(This article is not displayable. Please see full text pdf.)
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Kanno et al. (1979) studied this question.