Influence of the Pre-deformation on Precipitation in 2024 AlCuMg Alloy.

R. FERRAGUT; A. SOMOZA; A. TOLLEY

MATERIALS SCIENCE FORUM

Trans Tech Publications Ltd.

Año: 2001 vol. 363 p. 88 - 90

0255-5476

A study on the influence of pre-deformation on the precipitation kinetics in the 2024 AlCuMg commercial alloy, using positron annihilation lifetime spectroscopy, Vickers microhardness and transmission electron microscopy is presented. Precipitation was induced by artificial aging heat treatments at 190°C in samples with four different pre-deformation degrees between 0% and 8%. Positron lifetime results show an acceleration of the aging kinetics as a consequence of pre-deformation, which is correlated with the changes in hardness. TEM characterization of the microstructure corresponding to two different thermomechanical treatments is presented. The role of the dislocations introduced by pre-deformation on the precipitation kinetics is discussed in terms of the heterogeneous precipitation on dislocations and the modifications in the bulk precipitation.