Analysis of Multi-angular Twist Channel Extrusion Technique for Processing AA2024 Aluminium Alloy

This article proposes a new severe plastic technique named Multi-angular twist channel extrusion (MATE) to process the AA2024 aluminium alloy in a single pass. This method was devised to impose a large strain in a single pass with better strain homogeneity and lower punch load. To understand the deformation behavior of the AA2024 alloy during the MATE process, hardness, strain behavior, and microstructure analysis were performed in each shear zones. From the finite element analysis, an average effective strain of 2.78 was achieved with good strain homogeneity. The tensile strength and hardness of AA2024 alloy were increased by 80.5 and 91.27%, respectively. The electron back scatter diffraction analysis reveals that the average grain size was 1.8 mu m and a strong texture was developed in the processed AA2024 alloy. The XRD analysis reveals a high amount of dislocation density (3.18 x 10(14) M-2) in the extruded metal. Enhancement in the mechanical properties was attributed to grain refinement and strain hardening. Continuous dynamic recrystallization has occurred due to the formation of fine grains and the conversion of low-angle grain boundaries to high-angle grain boundaries during the MATE process.

Automated summary

This article proposes a new severe plastic technique called Multi-angular twist channel extrusion (MATE) for processing AA2024 aluminium alloy. The MATE method can impose a large strain in a single pass with better strain homogeneity and lower punch load. The study shows that an average effective strain of 2.78 was achieved with good strain homogeneity, and the tensile strength and hardness of the alloy were significantly increased. The MATE process also led to grain refinement, strain hardening, the development of a strong texture, and a high dislocation density in the extruded metal.