Результаты исследований: Научные публикации в периодических изданиях › статья в журнале по материалам конференции › Рецензирование
Nanostructures and microhardness in Al and Al-Mg alloys subjected to SPD. / Roven, H. J.; Liu, M.; Murashkin, M.; Valiev, R. Z.; Kilmametov, A. R.; Ungár, T.; Balogh, L.
в: Materials Science Forum, Том 604-605, 17.04.2009, стр. 179-185.Результаты исследований: Научные публикации в периодических изданиях › статья в журнале по материалам конференции › Рецензирование
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TY - JOUR
T1 - Nanostructures and microhardness in Al and Al-Mg alloys subjected to SPD
AU - Roven, H. J.
AU - Liu, M.
AU - Murashkin, M.
AU - Valiev, R. Z.
AU - Kilmametov, A. R.
AU - Ungár, T.
AU - Balogh, L.
PY - 2009/4/17
Y1 - 2009/4/17
N2 - Nanostructures and microhardness of a commercial purity Al, three binary Al-Mg alloys and a commercial AA5182 alloy subjected to high pressure torsion (HPT) at room temperature were comparatively investigated using high-resolution transmission electron microscopy, X-ray diffraction (XRD) and high-resolution XRD line profile analysis. The hardness values of HPT samples are twice to three times larger than that of the undeformed counterparts. Grain sizes measured by XRD are in the range 10-200 nm with typical average values ranging from 46 to 120 nm. The hardness values and the dislocation densities increased, whereas, the average grain size decreased significantly with increasing Mg contents. Typical dislocation densities are in the range 1.7 × 1014 m-2- 2.3 x 1015 m-2. However, local densities in grain boundary and triple junction areas might be as high as 1017 m-2. The strengthening mechanisms contributing to high hardness may primarily be attributed to the cooperative interactions of high dislocation densities, grain boundaries and planar interfaces.
AB - Nanostructures and microhardness of a commercial purity Al, three binary Al-Mg alloys and a commercial AA5182 alloy subjected to high pressure torsion (HPT) at room temperature were comparatively investigated using high-resolution transmission electron microscopy, X-ray diffraction (XRD) and high-resolution XRD line profile analysis. The hardness values of HPT samples are twice to three times larger than that of the undeformed counterparts. Grain sizes measured by XRD are in the range 10-200 nm with typical average values ranging from 46 to 120 nm. The hardness values and the dislocation densities increased, whereas, the average grain size decreased significantly with increasing Mg contents. Typical dislocation densities are in the range 1.7 × 1014 m-2- 2.3 x 1015 m-2. However, local densities in grain boundary and triple junction areas might be as high as 1017 m-2. The strengthening mechanisms contributing to high hardness may primarily be attributed to the cooperative interactions of high dislocation densities, grain boundaries and planar interfaces.
KW - Aluminium alloys
KW - Dislocation density
KW - Hardness
KW - High pressure torsion
KW - Nanostructures
KW - Severe plastic deformation
UR - http://www.scopus.com/inward/record.url?scp=60849135532&partnerID=8YFLogxK
U2 - 10.4028/3-908453-09-7
DO - 10.4028/3-908453-09-7
M3 - Conference article
AN - SCOPUS:60849135532
VL - 604-605
SP - 179
EP - 185
JO - Materials Science Forum
JF - Materials Science Forum
SN - 0255-5476
T2 - International Conference Recent Developments in the Processing and Applications of Structural Metals and Alloys
Y2 - 22 June 2008 through 25 June 2008
ER -
ID: 42939497