Compared microstructure and properties of an AlZnMgCu alloy processed by high pressure sliding and high-pressure torsion

Achieving high yield strength via submicrometer grain size and nanoscaled precipitation has been reached in 7### aluminum alloys thanks to severe plastic deformation (SPD) by High Pressure Torsion (HPT) process. Unfortunately, this technique inherently strong limitations since only small parts can be processed the strain is not homogeneous. These prevent large scale production of Ultra Fine Grain (UFG) materials for potential applications. A recent process, Sliding (HPS) developed Fujioka Horita, allows homogeneously deform sheets shear at higher speed. In work, competition between precipitation, growth recrystallization during heat treatments after SPD was studied depth an AlZnMgCu deformed HPS with two levels (γ ≈ 15 γ 20) order investigate if mechanical properties obtained HPT HPS. Microstructures analyses ageing were carried out transmission electron microscopy situ angle X ray scattering then related behavior evaluated tensile tests. Experimental data show very similar microstructures HPT, a good thermal stability recovery. The microstructural features lead exceptional (>800 MPa) as compared classical alloys. This study therefore promising towards aim obtaining suitable