The decomposition in AlCu and AlCuMg alloys during one‐step ageing is pursued with the experimcntal methods: Vickers hardness measurement, dilatometry, and transmission electronmicroscopy. The results indicate that magnesium accelerates the decomposition and the proportion of thc heterogeneous nucleation is increased. This is mainly caused by the greater loop density. Mg‐containing GPZ(Mg) and θ″(Mg) are formed.
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