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[en] The results of the effect of small addition (0.25 at.%) of Ge on aging kinetics of a complex aluminum alloy containing (wt.%) 5.9% Cu, 0.28% Si and 0.6% (total amount of Fe, Ti, Mn, Zr and V) are presented in this paper. Aging was performed at 190oC in the interval ranging from 10min to 256h. Hardness measurements, light (LM), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC) were used for microstructural characterization during aging. It was shown that the maximum of hardness in alloy containing Ge was achieved three times faster than in the alloy without Ge. TEM results clearly revealed that the accelerated kinetics should be ascribed to heterogeneously nucleated Si-Ge particles serving as sites for dense and fine distribution of θ' strengthening precipitates. Accelerated kinetics of aging was accompanied by increase in hardness. (Original)
Source
Mickovski, Jovan (ed.) (Faculty of Technology and Metallurgy, St. 'Cyril and Methodius' University, Skopje (Macedonia, The Former Yugoslav Republic of)); Macedonian Union of Metallurgists, Skopje (Macedonia, The Former Yugoslav Republic of); [378 p.]; ISBN 9989-9571-0-X; 
; 2003; p. 179-184; 3. Balkan Metallurgical Conference; 3-ta Balkanska konferencija na metalurzite; Ohrid (Macedonia, The Former Yugoslav Republic of); 24-27 Sep 2003; Also available from the National and University Library 'Kliment Ohridski', Skopje, Macedonia; 16 refs.,1 tab., 5 figs.
; 2003; p. 179-184; 3. Balkan Metallurgical Conference; 3-ta Balkanska konferencija na metalurzite; Ohrid (Macedonia, The Former Yugoslav Republic of); 24-27 Sep 2003; Also available from the National and University Library 'Kliment Ohridski', Skopje, Macedonia; 16 refs.,1 tab., 5 figs.