J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (12): 2235-2239.DOI: 10.1016/j.jmst.2018.06.015
• Orginal Article • Previous Articles Next Articles
Cheng Liua, Yuman Zhub1, Qun Luoa, Bin Liua, Qinfen Guc, Qian Lia*()
Received:
2018-06-12
Revised:
2018-06-15
Accepted:
2018-06-17
Online:
2018-12-20
Published:
2018-11-15
Contact:
Li Qian
Cheng Liu, Yuman Zhu, Qun Luo, Bin Liu, Qinfen Gu, Qian Li. A 12R long-period stacking-ordered structure in a Mg-Ni-Y alloy[J]. J. Mater. Sci. Technol., 2018, 34(12): 2235-2239.
Fig. 1. (a) Experimental XRD pattern of Mg80Ni5Y15 compared with calculated LPSO XRD patterns; (b) SEM backscattered electron image of Mg80Ni5Y15 annealed at 500 °C for 3 d.
Fig. 2. (a) Low-magnification HAADF-STEM image showing the microstructure of the as-cast Mg80Ni5Y15 alloy that was annealed at 500 °C for 3 d; (b) Atomic-scale HAADF-STEM image from area A in (a) confirming a Mg24Y5 structure viewed along <111> direction, which is further evidenced by the inserted Fourier-filtered transform pattern.
Fig. 3. SAED patterns from area B in Fig. 1(a) with beam direction parallel to (a) <11 2ˉ 0>α and (b) <1 0?1ˉ?0 >α; (c) Atomic-scale HAADF-STEM image taken along <11 2ˉ 0>α. The streaks marked by yellow arrows result from the Ni/Y enriched periodically in the closed-stacking planes.
Fig. 4. (a) HAADF-STEM images of the 12R LPSO phase taken along the <10 1ˉ?0 >α; (b-e) Shift distances between building clusters in adjacent building blocks. They are expressed by relative positions of Y atoms in outer layers of each building block.
Fig. 5. (a) Structure model for the 12R; (b) The stacking sequence of closed-packed planes by the projection along the <01 1ˉ 0 > ; (c-e) The stacking relationship of the building blocks by the projection along <2 1ˉ?1ˉ 0 > , <1 2ˉ?10 > and <11 2ˉ 0> corresponding to the images observed from HAADF-STEM.
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