Evolution of microstructures in severely deformed AA 3104 aluminum alloy by multiple constrained compression

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2011-06, Vol.528 (16), p.5405-5410
• Main Authors: Liu, W.C., Chen, M.B., Yuan, H.
• Format: Article
• Language: English
• Subjects: Aluminum alloys; Aluminum base alloys; Applied sciences; Boundaries; Compressing; Constraints; Cross-disciplinary physics: materials science; rheology; Deformation; Deformation, plasticity, and creep; Elasticity. Plasticity; Electron microscopy; Exact sciences and technology; Lamellar structure; Materials science; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Microstructure; Multiple constrained compression; Physics; Strain; Treatment of materials and its effects on microstructure and properties; Ultra-fine grain
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2011.03.100

► MCC in a channel die is a valid means of imparting severe plastic deformation. ► Large scale shear bands and the evidence for strain localization are observed. ► A cell block structure with high-angle boundaries is developed at large strain. ► Shear deformation results in finer structure with higher misorientation. AA 3104 aluminum alloy was severely deformed by multiple constrained compression in a channel die set-up. The evolution of microstructures during deformation was investigated by transmission electron microscopy. The flow stress in multiple constrained compression initially increases markedly with strain and then increases gradually. Large scale shear bands and the evidence for strain localization are observed. The microstructure consists of dislocation cells and extended boundaries after two passes to a strain of 0.86, while a cell block structure with high-angle lamellar boundaries is formed after eight passes to a strain of 3.56.