Grain Refinement Mechanisms Oterative during Equal Channel Angular Pressing of Aluminium

Abstract:

Grain refinement of aluminum deformed by equal channel angular pressing is strongly dependent on the amount of strain. The refinement process at low to high strain level involves elongation of the existing grains by shear deformation, their subdivision into bands and subgrain formation within bands, intersection of the bands during subsequent passes and finally conversion of the subgrains to grains by continuous dynamic recrystallization process. At room temperature the conversion of subgrains to grains takes place by progressive lattice rotation.

• Periodical: Materials Science Forum (Volumes 702-703)
• Pages: 135-138
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.702-703.135
• Online since: December 2011
• Authors: Rampada Manna, N.K. Mukhopadhyay, G.V.S. Sastry
• Keywords: Equal-Channel Angular Pressing (ECAP), Geometric Dynamic Recrystallization, Grain-Refining Mechanism, Progressive Lattice Rotation, Ultra-Fine Grain (UFG)

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