Schmidt, U.; Unger, R.
The correlation between microstructure and thermomechanical properties studied on
AlCuMg-based alloys.
Schmidt, U.; Unger, R.: The correlation between microstructure and
thermomechanical properties studied on AlCuMg-based alloys.
Proc. 3rd Europ. Conf. on Advanced Materials and Processes. Paris,
France, 8–10 June 1993.
In: J. Phys. France IV, Colloque C7,
supplement au J. Phys. France III, vol. 3 (1993) 197–205,
DOI: 10.1051/jp4:1993730.
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 (0.23wt%) 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 concentrations 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.