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Grain refinement through shear banding in severely plastic deformed A206 aluminum alloy

journal contribution
posted on 2018-01-01, 00:00 authored by Parya Teymoory, Abbas Zarei-Hanzaki, Ehsan Farabi, Hossein Monajati, Hamid Reza Abedi
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.

History

Journal

Advanced engineering materials

Volume

20

Issue

1

Article number

1700502

Pagination

1 - 12

Publisher

John Wiley & Sons

Location

Chichester, Eng.

ISSN

1438-1656

eISSN

1527-2648

Language

English

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2017, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim