Abstract
The changes in mechanical properties of Al-10 pct Mg casting alloys during natural aging up to about 13 years were investigated. An elongation of more than 20 pct in specimens naturally aged for less than 3 months fell to only 1 ∼ 2 pct due to natural aging over ten years. By reversion experiments and electron microscopy, it was shown that this large decrease in ductility was caused by the formation of spherical coherent GP zones during the process of natural aging. TEM investigations also indicated that the structure of GP zone appears to be the Ll2 structure, in which Al and Mg atoms alternately align in three-dimensional periodicity along the [100] direction.
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