期刊
MICROSCOPY AND MICROANALYSIS
卷 19, 期 6, 页码 1575-1580出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S1431927613012750
关键词
Mg-Zn-Y alloy; LPSO phase; space group; STEM
资金
- National Basic Research Program of China [2009CB623705]
Transmission electron microscopy characterization of two major long-period stacking ordered (LPSO) phases in Mg-Zn-Y alloy, i.e., 18R- and 14H-LPSO are reported. The space group and atomic-scale microstructures of both compounds were determined using a combination of electron diffraction, convergent beam electron diffraction, high-resolution transmission electron microscopy, and Z-contrast scanning transmission electron microscopy. The 18R-LPSO phase is demonstrated to have a point group and space group 3m and R3m (or (3) over barm and R (3) over barm), with the lattice parameter a = 1.112 nm and c = 4.689 nm in a hexagonal coordinate system. The 14H-LPSO phase has a point group 6/mmm and a space group P6(3)/mmc, and the lattice parameter is a = 1.112 nm and c = 3.647 nm. In addition, insertion of extra thin Mg platelets of several atomic layers, results in stacking faults in the LPSO phase. These results may shed some new light on a better understanding of the microstructure and deformation mechanisms of LPSO phases in Mg alloys.
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