TY - JOUR
T1 - Morphological and crystallographic anisotropy of severely deformed commercially pure aluminium by three-dimensional electron backscatter diffraction
AU - Naghdy, Soroosh
AU - Pirgazi, Hadi
AU - Verleysen, Patricia
AU - Petrov, Roumen
AU - Kestens, Leo
PY - 2017
Y1 - 2017
N2 - International Union of Crystallography. The aim of this paper is to examine the morphological and crystallographic anisotropy that develops during high-pressure torsion (HPT) processing. Commercially pure aluminium was subjected to monotonic HPT deformation at room temperature. The microstructure and texture were studied by large-area electron backscatter diffraction (EBSD) scans. Three-dimensional EBSD scans served to s crutinize the morphological anisotropy and local texture. It was observed that two distinct stages of grain fragmentation and saturation occur during processing. Grains exhibited an ellipsoidal shape rather than an equi-axed one. The major axes of the ellipsoids showed a favorable orientation at the steady-state stage: an almost 20° inclination towards the shear direction. The global texture was characterized by typical shear components of face-centered cubic metals at both stages. However, the local texture revealed a preferential fragmentation pattern in the first stage: orientations in the vicinity of ideal fibers became less heavily fragmented while non-ideal orientations broke up more severely. This phenomenon was linked with the lattice rotation required to bring an initial orientation close to a stable one. Although the texture weakened considerably in the fragmentation stage, the texture index did not further decrease in the saturation stage. Saturation of texture, grain refinement and formation of microstructure are discussed in the light of different microstructural coarsening mechanisms.Morphological and crystallographic anisotropy of severely deformed commercially pure aluminium is studied by conventional and three-dimensional electron backscatter diffraction. Saturation of texture, grain refinement and the formation of microstructure are discussed in the light of different microstructural coarsening mechanisms.
AB - International Union of Crystallography. The aim of this paper is to examine the morphological and crystallographic anisotropy that develops during high-pressure torsion (HPT) processing. Commercially pure aluminium was subjected to monotonic HPT deformation at room temperature. The microstructure and texture were studied by large-area electron backscatter diffraction (EBSD) scans. Three-dimensional EBSD scans served to s crutinize the morphological anisotropy and local texture. It was observed that two distinct stages of grain fragmentation and saturation occur during processing. Grains exhibited an ellipsoidal shape rather than an equi-axed one. The major axes of the ellipsoids showed a favorable orientation at the steady-state stage: an almost 20° inclination towards the shear direction. The global texture was characterized by typical shear components of face-centered cubic metals at both stages. However, the local texture revealed a preferential fragmentation pattern in the first stage: orientations in the vicinity of ideal fibers became less heavily fragmented while non-ideal orientations broke up more severely. This phenomenon was linked with the lattice rotation required to bring an initial orientation close to a stable one. Although the texture weakened considerably in the fragmentation stage, the texture index did not further decrease in the saturation stage. Saturation of texture, grain refinement and formation of microstructure are discussed in the light of different microstructural coarsening mechanisms.Morphological and crystallographic anisotropy of severely deformed commercially pure aluminium is studied by conventional and three-dimensional electron backscatter diffraction. Saturation of texture, grain refinement and the formation of microstructure are discussed in the light of different microstructural coarsening mechanisms.
KW - aluminium
KW - anisotropy
KW - grain fragmentation
KW - high-pressure torsion (HPT)
KW - three-dimensional electron backscatter diffraction (3D-EBSD)
UR - http://resolver.tudelft.nl/uuid:bd806a31-bd2e-4b16-9a61-b6f37f9f6387
UR - http://www.scopus.com/inward/record.url?scp=85030557802&partnerID=8YFLogxK
U2 - 10.1107/S1600576717012754
DO - 10.1107/S1600576717012754
M3 - Article
AN - SCOPUS:85030557802
SN - 0021-8898
VL - 50
SP - 1512
EP - 1523
JO - Journal of Applied Crystallography
JF - Journal of Applied Crystallography
IS - 5
ER -