Influence of the history of materials from the 2xxx series of aluminium alloys on structure and mechanical properties after deformation by ECAE method and annealing

Marzena Lech-Grega ,  Juliusz Senderski ,  Sonia Boczkal ,  Bartłomiej Płonka 

The Institute of Non-Ferrous Metals Light Metals Division in Skawina (OML), Piłsudskiego 19, Skawina 32-050, Poland

Abstract

Equal channel angular extrusion method has been used to deform AlCu(Si,Mg) alloys in the range of true strain ε = 1.15 – 2.3. The starting material for the investigation were samples obtained by extrusion from ingots and powder consolidation. The influence of the true strain on structure and properties was studied by optical and transmission electron microscopes and hardness measurement. Increasing of the strains led to refinement of structure and raised the properties. In structure, the mutually crossing microbands were observed against the background with high density of dislocations. After additional annealing, the microstructure was composed of almost equiaxed grains. The hardness measurements show higher properties in material prepared by powder consolidation. The obtained results prove that there are differences in structure and properties of the same alloy processed by ECAE deformation method two different initial materials.

 

Presentation: poster at E-MRS Fall Meeting 2005, Symposium I, by Marzena Lech-Grega
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-30 10:30
Revised:   2009-06-07 00:44