Grain Refinement through Shear Banding in Severely Plastic Deformed A206 Aluminum Alloy

Abstract

The present work is conducted to study the microstructure and texture evolutions in an as-cast A206 aluminum alloy after applying severe plastic deformation. Toward this end, the material is severely deformed through accumulative back extrusion (ABE) technique at 200 C and followed by assessing the room temperature mechanical properties of the products. The macro shear-bands formation in the highly strained regions can result in grain refinement through the geometric dynamic recrystallization mechanism. A significant refinement is also characterized within the micro shear-bands; this is attributed to the intensified substructure development and the occurrence of continuous dynamic recrystallization. The corresponding inverse pole figure maps show similar orientation for these newly refined grains with the parent ones. A random texture is produced through sub-grain rotation to dissimilar orientation at the intersection of micro-bands. The assessment of mechanical properties of the processed materials reveal significant increase in both yield and ultimate tensile strength values. The hardness profiles also demonstrate a relatively homogenous microstructure after three and five ABE passes holding a mean hardness value of 183 Vickers.

Effect of Severe Plastic Deformation, through Equal-Channel Angular Press Processing, on the Electrochemical Behavior of Al5083 Alloy

“…On the contrary, only a weak Raman signal of α-Al(OH) 3 at 659 cm −1 was detected in the as-received sample immersed in the same solution. The nonappearance of noticeable Raman bands of Al(OH) 3 in the as-received samples submerged in the solution is likely a sign of fewer corrosion products on these samples when compared with the ECAP samples [59].…”

Generalized Stacking Fault Energies of Aluminum Alloys–Density Functional Theory Calculations

“…GSFEs for the principal components of aluminum alloys series 1xxx (Si), 2xxx (Cu, Mg), 4xxx (Si), 5xxx (Mg), 6xxx (Mg, Si), and 7xxx (Mg, Cu, Zn) have been reported [12,18,19]. SFEs of Al alloys with Sr, Sc, Y, Ge, Fe, Ti, Li, Si, Mg, Cu, and Zn have also been calculated as a function of temperature [20] Mechanical properties of Al-Sc [21], Al-Zn [22], Al-Cu-Mn-Mg-Zn-Fe [23], and Al-Zn-Cu-Zr [8] alloys have recently been investigated. GSFE has not been calculated for Al alloys with elements, such as Sc, Zr, Mn, Fe.…”

Optimizing the mechanical properties of Al-4.5Cu-xSi alloys through multi-pass friction stir processing and post-process aging

“…According to Heidarzadeh et al [24], Patel et al [25], Patel et al [26], and Patel et al [27], these grains are formed as result of the combined effect of heat and intensive mechanical deformation through a dynamic recrystallization process contributing to the mechanical properties improvement. This is of special importance in Al alloys which due to their high stackingfault energy [28], cannot be effectively refined by thermomechanical-induced recrystallization mechanism [29].…”