Numerical and experimental studies on deformation behavior of 5083 aluminum alloy strips in equal channel angular rolling

Abstract

Improvement of mechanical properties of metal strips can be achieved by producing ultra-fine grained microstructure. The equal channel angular rolling process is one of the effective severe plastic deformation techniques which can lead to proper ultra-fine grained structures. In this research, the influence of process parameters such as pre-equal channel angular rolling annealing temperature, number of equal channel angular rolling passes, routes and post-equal channel angular rolling annealing on deformation behavior of 5083 Al alloy is investigated by experimental studies and numerical simulations. Metallurgical investigations revealed that grain refinement and increased dislocation density are two effective parameters on the mechanical strength improvement. The investigation of mechanical properties demonstrated that increasing number of equal channel angular rolling passes leads to a considerable increase in yield stress, ultimate tensile strength and hardness. In contrast, elongation was dramatically reduced. Also, improvement of mechanical properties reaches saturation at a critical strain level, depending on the microstructure evolution. In addition, investigation of effects of post-equal channel angular rolling annealing on the specimens annealed at 415°C indicated that elongation and toughness increase, accompanying with a low decrease in yield and tensile strengths and hardness. In this study, the equal channel angular rolling process was numerically simulated using ABAQUS software in two different routes for three passes. It is shown that upper roller force is increased by increasing the number of equal channel angular rolling passes, but the rate of this increase is reduced at higher passes.

Manufacturing and mechanical characterization of Mg-4Y-2Nd-0.4Zr-0.25La magnesium microtubes by combined severe plastic deformation process for biodegradable vascular stents

“…46,47 Also, there is a small increase in hardness after the extrusion process. The increase in the hardness can be due to the grain refinement 48 because it is commonly accepted that materials with HCP structure such as magnesium alloys show a high grain size dependency of strength and hardness due to the lack of slip systems. 22 However, the microhardness of material is reduced after MTE because of higher processing temperature which usually has an adverse effect on the hardness and strength.…”

Manufacturing of high strength thin-walled aluminum 6063 tubes through severe plastic deformation combined with peak-aging treatment

“…Afterward, different processes have been developed considering the concept of SPD while multiple studies have been devoted to optimize the SPD processes through modeling and experiments. [1][2][3][4][5] Although multiple processes have been introduced for the imposition of SPD on solid sections like bars and plates, the SPD of hollow sections like tubes has been only considered during the past decade, probably because of the complexities of the related processes. For more explanations, high-pressure tube twisting (HPTT) has been introduced by Toth et al 6 to impose the SPD on tubular sections.…”