Microstructure, Texture and Mechanical Properties in Aluminum Produced by Friction-Assisted Lateral Extrusion

Abstract

The Friction-Assisted Lateral Extrusion Process (FALEP) is a severe plastic deformation (SPD) technique for producing metal sheets from bulk metal or powder in one single deformation step at room temperature. In the present work, aluminum Al-1050 was deformed by FALEP. Then, its microstructure was examined by EBSD; the crystallographic texture by X-ray; material strength, ductility, and the Lankford parameter by tensile testing; the latter also by polycrystal plasticity simulations. It is shown that the microstructure was highly refined, with the grain size reduced more than 160 times down to 600 nm under the imposed shear strain of 20. The obtained texture was a characteristic simple shear texture with a shear plane nearly parallel to the plane of the sheet. The yield and ultimate strengths increased by about 10 times and three times, respectively. The Lankford parameter was 1.28, which is very high for aluminum, and due to the specific shear texture, unusual in a sheet. All these exceptional characteristics of Al-1050 were obtained thanks to the efficiency of the FALEP SPD process, which is a promising candidate for industrial applications.

Evidence for a stable single component sharp texture in high purity aluminum during tube high-pressure shearing at room temperature

“…The significant difference between the present investigation and previously reported “oblique” or rotated cube components 52 , 74 , 75 relates to their stability. During ECAP of 5N Al in route A, after the 1st, 2nd and 3rd pass the component rotates anticlockwise around the transverse direction (equivalent to the z-axis of t -HPS) through 16°, 18° and 21° 52 .…”

“…It is worth noting that an “oblique” cube component was reported earlier in 5N, 1050 aluminum and 4N Nickel in shear-dominated deformation of ECAP 52 , Friction-Assisted Lateral Extrusion 74 and HPT 75 , which is the closest reported texture component to the present observed single component { } <110> sharp texture.…”

“…However, in the present work the { } <110> component was formed and thereafter there was no rotation of this orientation and it was stable upon subsequent shear processing with continuous intensification. This is in distinct contrast to the stability feature of the “oblique” or rotated cube components observed earlier where the cube components are subjected to the orientation flow and rotate with the imposed rigid body spin under simple shear so that this component is considered unstable in simple shear 52 , 74 , 75 .…”

Deformation Behaviour of Cold-Rolled Ni/CNT Nanocomposites

“…The respective PF of the samples illustrates these differences between the two samples. The texture difference can be related to the fact that the presence of CNTs alters the grain rotation during sintering and, in addition, affects the movement and rearrangement of dislocations originating during the dispersion/mixture process, which directly influences the extension of recovery and recrystallization occurring during the sintering of samples, as reported in previous works [3,22].Several authors have already used the grain boundary misorientation angle to study the deformation of metallic materials [13,[31][32][33]. In that sense, a study of the grain boundaries' character and misorientation was also carried out in the as-sintered samples to understand to what extent the reinforcement can influence these important parameters to be evaluated when the samples are subjected to plastic deformation.…”

Investigation on the Strengthening Mechanism of Flow Control Extrusion by Using Experiment and Numerical Simulation

“…One of the main strengthening mechanisms for polycrystalline materials is grain boundary strengthening [1][2][3][4]. The main solution to realize the grain refinement is the severe plastic deformation technique.…”