Microstructure Evolution of AA1070 Aluminum Alloy Processed by Micro/Meso-Scale Equal Channel Angular Pressing

Abstract

The Micro/meso-forming of commercially pure aluminum, AA1070, processed at room temperature by equal channel angular pressing (ECAP) with a die channel angle of 90° through 4 deformation passes has been conducted. Microstructure features, such as grain size, misorientation angle distributions and the developed texture during the four deformation passes of micro/meso-ECAP have been investigated by Electron backscattering diffraction (EBSD) technique. Then, hardness measurements over the cross-section of the processed samples were correlated with the EBSD analysis. EBSD scans revealed that extended shear bands (SBs) are formed and represent the microstructural feature induced during micro/meso-forming. Whereas, a non-uniform grain structure consisting of intensive low-angle grain boundaries was obtained in the first pass, a uniform ultrafine-grained structure of high-angle grain boundaries (in the range of 1-2 μm) was achieved at the fourth pass. Consequently, a significant improvement in the hardness value to 65.3%, with respect to the starting material, was achieved due to the enhancement of the fine grain structure. The texture analysis exhibited that the high plastic shear strain associated with micro/meso-scale ECAP was capable to develop a weak texture in the flow plane compared to the starting texture.

Microstructural evolution during extrusion of equal channel angular-pressed AA1070 alloy in micro/mesoscale

“…The load-stroke curves for the samples subjected to ECAP processing were recently reported in Ref. [12].

Figure 1 Schematic illustration of the sequence of the extrusion processes in this study.

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“…This design has the ability to process a smooth surface sample without any cracks or burrs that can be inevitably formed if the samples processed via convenential ECAP in which the two halves of the die are cutting along the channels. The experimental design was described in detail elsewhere [12]. The micro-ECAP die has a square cross-section with inner dimensions of 8 × 8 mm 2 and 20 mm in length.…”

“…The load-stroke curves for the samples subjected to ECAP processing were recently reported in Ref. [12].…”

Grain size affecting the deformation characteristics via micro-injection upsetting

“…A cover plate is implemented to avoid detaching the two parts of the ECAP die. More details about MMSECAP die and the typical appearance of the specimens processed by MMSECAP can be found in our previous study [28].…”

Utility of 2‐Acetyl Benzofuran for the Synthesis of New Heterocycles as Potential Anticancer Agents

“…In addition, benzofuran derivatives have been reported to possess a wide variety of pharmacological properties, viz. anti-inflammatory [1,2], anticancer [3], antimicrobial [4,5], antioxidant [6], antitubercular [7], anti-TB [8], anticonvulsant [9], anti-AChE [10], and antagonistic [11] activities. On the other hand, literature survey revealed that pyrazoline derivatives possess a broad spectrum of biological activities including anticancer, antiinflammatory, antihypotensive, antidepressant, anticonvulsant, antimicrobial, and antitubercular activities [12][13][14][15][16][17][18].…”