TY - GEN
T1 - The crystal structure of the β'-phase including Ag in Al-Mg-Si-Ag alloy
AU - Nakamura, Junya
AU - Matsuda, Kenji
AU - Sato, Tatsuo
AU - Marioara, C. D.
AU - Andersen, S. J.
AU - Holmestad, R.
AU - Ikeno, Susumu
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012
Y1 - 2012
N2 - In the present work, β' phase in alloys Al -1.0 mass% Mg 2Si -0.5 mass% Ag (Ag-addition) and Al -1.0 mass% Mg 2Si (base) was investigated by high resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) to understand the effect of Ag addition. The β' phase is rod-shape with the longest direction parallel to 〈001〉 Al. HRTEM images and SAED patterns obtained along the direction were similar for the β' phase in both alloys. The unit cell of β'-phase in Ag-addition alloy is hexagonal with the same c-axis dimension as the Ag-free β', but shorter a-axis. Ag was found in the composition of the rod-shaped precipitates in Ag-addition alloy by energy dispersive X-ray spectroscopy (EDS). In addition, the distribution of Ag was investigated by energy filtered mapping and high annular angular dark field scanning transmission electron microscopy (HAADF-STEM). The Ag-containing atomic column was observed in every β' unit cell, and the unit cell symmetry is slightly changed as compared with the Ag-free β'. The Ag-containing β' rods have complicated domain structures. The interfaces of these particles are enriched with Ag atoms that occupy the lattice positions in the Al matrix. The occupancy of the Ag-containing atomic columns seem to vary both inside particles, as well as at the interfaces.
AB - In the present work, β' phase in alloys Al -1.0 mass% Mg 2Si -0.5 mass% Ag (Ag-addition) and Al -1.0 mass% Mg 2Si (base) was investigated by high resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) to understand the effect of Ag addition. The β' phase is rod-shape with the longest direction parallel to 〈001〉 Al. HRTEM images and SAED patterns obtained along the direction were similar for the β' phase in both alloys. The unit cell of β'-phase in Ag-addition alloy is hexagonal with the same c-axis dimension as the Ag-free β', but shorter a-axis. Ag was found in the composition of the rod-shaped precipitates in Ag-addition alloy by energy dispersive X-ray spectroscopy (EDS). In addition, the distribution of Ag was investigated by energy filtered mapping and high annular angular dark field scanning transmission electron microscopy (HAADF-STEM). The Ag-containing atomic column was observed in every β' unit cell, and the unit cell symmetry is slightly changed as compared with the Ag-free β'. The Ag-containing β' rods have complicated domain structures. The interfaces of these particles are enriched with Ag atoms that occupy the lattice positions in the Al matrix. The occupancy of the Ag-containing atomic columns seem to vary both inside particles, as well as at the interfaces.
KW - Ag addition
KW - Aluminum-magnesium-silicon alloy
KW - Crystal structure
KW - High-angle-annular-dark-field scanning transmission electron microscope
KW - High-resolution transmission electron microscope
KW - β'-phase
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U2 - 10.4028/www.scientific.net/AMR.409.67
DO - 10.4028/www.scientific.net/AMR.409.67
M3 - Conference contribution
AN - SCOPUS:84855219981
SN - 9783037853047
T3 - Advanced Materials Research
SP - 67
EP - 70
BT - THERMEC 2011 Supplement
T2 - 7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011
Y2 - 1 August 2011 through 5 August 2011
ER -