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Grain Refinement through Shear Banding in Severely Plastic Deformed A206 Aluminum Alloy
Author(s) -
Teymoory Parya,
ZareiHanzaki Abbas,
Farabi Ehsan,
Monajati Hossein,
Abedi Hamid Reza
Publication year - 2018
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201700502
Subject(s) - materials science , substructure , microstructure , alloy , recrystallization (geology) , severe plastic deformation , grain size , dynamic recrystallization , shear (geology) , extrusion , ultimate tensile strength , deformation bands , composite material , plasticity , metallurgy , vickers hardness test , shear band , hot working , structural engineering , paleontology , engineering , biology
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.