High pressure torsion to refine grains in pure aluminum up to saturation : Mechanisms of structure evolution and their dependence on strain
Orlov, Dmitry LU
; Kamikawa, Naoya
and Tsuji, Nobuhiro
(2012)
In Philosophical Magazine
92(18).
p.2329-2350
- 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 ∈ eq ≤ 1; (ii) a transition stage in the range 1eq ≤ 8; and (iii) a saturation stage in the range ∈ eq 8. In stages (i) and... (More)
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 ∈ eq ≤ 1; (ii) a transition stage in the range 1eq ≤ 8; and (iii) a saturation stage in the range ∈ eq 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.
(Less)
- author
- Orlov, Dmitry
LU
; Kamikawa, Naoya
and Tsuji, Nobuhiro
- publishing date
- 2012-06-21
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- aluminum, EBSD, grain refinement, high pressure torsion, microstructure
- in
- Philosophical Magazine
- volume
- 92
- issue
- 18
- pages
- 22 pages
- publisher
- Taylor & Francis
- external identifiers
-
- scopus:84861880023
- ISSN
- 1478-6435
- DOI
- 10.1080/14786435.2012.671548
- language
- English
- LU publication?
- no
- id
- 906a68d6-10f5-41a4-902c-a8332885a1b9
- date added to LUP
- 2016-06-20 15:36:22
- date last changed
- 2022-01-30 04:37:11
@article{906a68d6-10f5-41a4-902c-a8332885a1b9,
abstract = {{<p>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 ∈ <sub>eq</sub> ≤ 1; (ii) a transition stage in the range 1eq ≤ 8; and (iii) a saturation stage in the range ∈ <sub>eq</sub> 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.</p>}},
author = {{Orlov, Dmitry and Kamikawa, Naoya and Tsuji, Nobuhiro}},
issn = {{1478-6435}},
keywords = {{aluminum; EBSD; grain refinement; high pressure torsion; microstructure}},
language = {{eng}},
month = {{06}},
number = {{18}},
pages = {{2329--2350}},
publisher = {{Taylor & Francis}},
series = {{Philosophical Magazine}},
title = {{High pressure torsion to refine grains in pure aluminum up to saturation : Mechanisms of structure evolution and their dependence on strain}},
url = {{http://dx.doi.org/10.1080/14786435.2012.671548}},
doi = {{10.1080/14786435.2012.671548}},
volume = {{92}},
year = {{2012}},
}