Effect of pre-deformation on the microstructures and properties of 2219 aluminum alloy during aging treatment

The changing of the microstructure and properties with the pre-deformation degree of the 2219 aluminum alloys during aging treatment was investigated. The results reveal that the pre-deformation leads to the increasing of the dislocation density in the matrix that in turn gives rise to the formation of the dense and smaller precipitated theta' phases with dispersive distribution in the a-matrix, which results in the enhancing of the strength of the pre-deformed samples. It is also observed that the strength of the 4.19% pre-deformed sample shows an abrupt slightly decline by comparing with the 2.88% pre-deformed sample, which caused by the formation of the non-uniformly distributed theta' precipitates due to the large amount of the dislocation cells formed by the pre-deformation in the matrix. (C) 2016 Elsevier B.V. All rights reserved.