Microstructure Evolution in Pure Al Processed with Twist Extrusion

Dmitry Orlov; Yan Beygelzimer; Sergey Synkov; Viktor Varyukhin; Nobuhiro Tsuji; Zenji Horita

doi:10.2320/matertrans.MD200802

Dmitry Orlov, Yan Beygelzimer, Sergey Synkov, Viktor Varyukhin, Nobuhiro Tsuji, Zenji Horita

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Keywords: aluminum, twist extrusion, severe plastic deformation, optical microscopy, electron backscattered diffraction (EBSD)

JOURNAL FREE ACCESS

2009 Volume 50 Issue 1 Pages 96-100

DOI https://doi.org/10.2320/matertrans.MD200802

View "Advance Publication" version (September 10, 2008).

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Abstract

High purity Al (99.99%) was subjected to severe plastic deformation through twist extrusion at room temperature. Microstructures were examined for 1 pass and 4 passes on the cross section perpendicular to the longitudinal axis of billets using optical microscopy and electron back scatter diffraction analysis. It was shown that a vortex-like material flow was observed on the cross section and this became more intense with increasing number of the pressing. After one pass, subgrain structures with low angle grain boundaries were developed throughout the section but after 4 passes, the microstructure consisted of grains surrounded by high angle boundaries with fraction of ∼70% in the edge parts. The average grain size at the edge parts is refined to ∼1.6 μm.

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