Journal
SCRIPTA MATERIALIA
Volume 75, Issue -, Pages 86-89Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2013.11.030
Keywords
Aluminum alloys; High-angle annular dark field; High-resolution EDX; Aging
Categories
Funding
- National Basic Research Program of China [2011CB610401]
- NNSF of China [51021063]
- Program for New Century Excellent Talents in University [NCET-10-0842]
- Fundamental Research Funds for the Central Universities [2011JQ021]
- China Scholarship Council [201206370114]
- European Research Council [246791-COUNTATOMS]
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The beta '' precipitates in a peak-aged Al-Mg-Si-Cu alloy were measured with an average composition of 28.6Al-38.7Mg-26.5Si-5.17Cu (at.%) using atom probe tomography. High-angle annular dark-field observations revealed that Cu incompletely substitutes for the Mg-1 and Si-3 columns, preferentially for one column in each pair of Si-3. Cu-free Si columns form a parallelogram-shaped network that constitutes the basis of subsequent precipitates in the system, with a = 0.37 nm, b = 0.38 nm, gamma = 113 degrees and c = 0.405 nm. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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