Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-197-C7-205
The correlation between microstructure and thermomechanical properties studied on AlCuMg-based alloysU. SCHMIDT and R. UNGER
Martin Luther University of Halle-Wittenberg, Department of Physics, 06099 Halle, Germany
This paper deals with the description of the structure and precipitation sequence of AlCu4.5 alloys with a content of Mg between those of binary AlCu and quasi-binary AlCuMg alloys. For alloys with a small Mg content (0.23 wt%) these are the coherent Cu-like GP zones and the incoherent θ' and θ phases with the adequate content of dissolved Mg, so the precipitation sequence can be essentially realized without any difficulties. In the case of higher Mg concentration a re-orientation occurs because it requires both time and energy. An undisturbed transition to the θ (Mg) phase is impossible. The phase structure becomes more similar to that of the S phase but it is not safe to say that it is already a quasi-binary structure. The different size developments between the AlCu4.5 and AlCuMg0.98 alloys are discussed.
© EDP Sciences 1993