Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 583, Issue -, Pages 445-451Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.08.200
Keywords
Aluminum alloy; Intermetallics; Rotation twin; Anti-phase; HAADF-STEM
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Funding
- Excellent Doctorate Foundation of Northwestern Polytechnical University
- 111 Project of China [B08040]
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The substructures in rotation-twinned T (Al20Cu2Mn3) particles were investigated by means of high resolution transmission electron microscopy (HRTEM) and high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) in the present work. A flattened hexagonal structural subunit with 20 atomic columns was proposed. The stacking mode of these subunits in non-defective T phase was proved to be tessellation of many flattened hexagonal subunits with the same orientations, while the stacking modes near anti-phase boundary (APB) and twin boundary (TB) were tessellations of two differently oriented flattened hexagonal subunits. The transition region at twin domain junctions has hybrid structure and perfect or imperfect pentagram structure. Centered with the perfect pentagram transition structure, a rotation twin with ten fan-shaped domains and constituted by five twin variants can be deduced. (C) 2013 Elsevier B. V. All rights reserved.
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