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High pressure torsion to refine grains in pure aluminum up to saturation: mechanisms of structure evolution and their dependence on strain.
- Source :
- Philosophical Magazine; Jun2012, Vol. 92 Issue 18, p2329-2350, 22p
- Publication Year :
- 2012
-
Abstract
- High-pressure torsion was used for the deformation processing of high-purity aluminum (4N-Al), while high-resolution electron-backscatter diffraction was used for the analysis of evolution of qualitative and quantitative microstructural characteristics. This study reveals a rather full picture of microstructure evolution in the high stacking fault energy fcc material and makes a continuous link between deformation microstructures at low, high and very high strains. Three stages of the microstructure evolution in 4N-Al at ambient temperature have been found: (i) the first stage in the range εeq ≤ 1; (ii) a transition stage in the range 1 < εeq ≤ 8; and (iii) a saturation stage in the range εeq ≥ 8. In stages (i) and (ii), grain subdivision and typical features of deformation microstructures are found. Starting from stage (ii), formation of small equiaxed (sub)grains surrounded by high-angle boundaries (HABs) is found together with minor increase in the average subgrain size. At stage (iii), recrystallized-like microstructure mostly consisting of the dynamically stable equiaxed subgrains surrounded by HABs dominates the microstructure. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 14786435
- Volume :
- 92
- Issue :
- 18
- Database :
- Complementary Index
- Journal :
- Philosophical Magazine
- Publication Type :
- Academic Journal
- Accession number :
- 76246282
- Full Text :
- https://doi.org/10.1080/14786435.2012.671548