Abstract
Transmission electron microscopy and measurements of hardness and electrical resistivity were carried out on the alloy aged at various temperatures 40 to 300°C. This alloy follows a similar course of precipitation as common Al-Cu-Mg alloys. The pre-precipitation zones G. P. B. are considerably formable in the early stage of aging at temperatures bellow 200°C. The forming rate of the G. P. B. zones increases with concentration of the solutes in the alloys having a same ratio of Cu: Mg. High density of dislocation loops and helices are found in the stages of the G. P. B. zones formation at 120°C or bellow. The S' phase precipitates and grows in the distored lath form at aging temperatures above 120°C forming corrugated composite sheets and chevron markings as in the common Al-Cu-Mg alloys. The S phase precipitates and grows in the lath form at elevated temperatures above 250°C. The growth rate of it is considerably lowered in the prolonged aging at 250°C for more than 104min.
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