Title: The microstructural characteristics of Al processed using severe plastic deformation procedures

Authors: Kinga Rodak, Tomasz Goryczka

Addresses: Silesian University of Technology, 8 Krasinskiego Street, Katowice 40-019, Poland. ' University of Silesia, 12 Bankowa Street, Katowice 40-007, Poland

Abstract: The structure of Al is subjected to Severe Plastic Deformation (SPD) by means of compression with oscillatory torsion and by combined method: compression and next compression with oscillatory torsion (combined method I) and compression followed by annealing at 250°C/1 min with next compression with oscillatory torsion (combined method II). Al samples were deformed at torsion frequency (f), changed from 0 Hz (compression) to 1.6 Hz under a constant torsion angle (α) ≈6° and compression speed (v) = 0.1 mm/s. For combined methods, the samples were compressed for strain ε = 0.7 and next deformed at mentioned parameters of compression with oscillatory torsion. The structural analysis shows that the processing by compression with oscillatory torsion ensures obtaining a structure (at selected parameters) with a mean grain size ≈1.6 µm. Combined methods of deformation lead to grain refinement to about ≈0.9 µm. Moreover, material with uniform Ultra-Fine Grained (UFG) microstructure was obtained. The microstructures contain high angle grain boundaries. Texture measurements reveal a weak texture after processing. [Received 11 April 2007; Accepted 26 July 2007]

Keywords: UFG microstructure; ultra fine grain; TEM; texture measurements; severe plastic deformation; SPD; aluminium; compression; oscillatory torsion; annealing; grain refinement.

DOI: 10.1504/IJCMSSE.2007.017252

International Journal of Computational Materials Science and Surface Engineering, 2007 Vol.1 No.5, pp.585 - 593

Published online: 21 Feb 2008 *

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