Structural investigation of precipitates with Cu and Zn atomic columns in Al-Mg-Si alloys by aberration-corrected HAADF-STEM

Electron Microscopy and Analysis Group Conference 2013

Saito, Takeshi^1 ; Marioara, Calin D.^2 ; Andersen, Sigmund J.^2 ; Lefebvre, Williams^3 ; Holmestad, Randi^1

Department of Physics, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway^1

SINTEF Materials and Chemistry, 7465 Trondheim, Norway^2

GPM, Université de Rouen, 76801 Saint Etienne du Rouvray, France^3

关键词: Aberration-corrected;    Al-Mg-Si alloys;    Atomic columns;    Cu addition;    High-angle annular dark fields;    Local configurations;    Specific sites;    Structural investigation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/522/1/012030/pdf
DOI  :  10.1088/1742-6596/522/1/012030

来源: IOP

【 摘 要 】

Precipitates in Al-Mg-Si alloys with Cu addition (∼0.1 wt%) and Zn addition (∼1 wt%) were investigated by aberration corrected high angle annular dark field scanning transmission electron microscopy (HAADF-STEM). Most precipitates had no overall unit cell but contained ordered network of Si atomic columns for both the Cu and the Zn containing precipitates. It was found that both Cu and Zn atomic columns are located at specific sites and producing characteristic local configurations on the Si atomic columns.