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Starting from the hypothesis(1) that elements with low solubility in Al have higher binding energies with vacancies than copper atoms and(2) that the size of the added element could affect the precipitation behaviour, a number of elements,viz.Pb , Cd, W, Be, Na and Ge were added to an Al-4% Cu alloy. The ageing process was studied by means of hardness measurements, X-ray analysis and electron microscopy. Preliminary experiments showed that Pb, W, Na and Ge did not have any effect and were thusdoi:10.2320/matertrans1960.13.149 fatcat:x5ktd5f6zvcj3nnhx4ugkfnmcu