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The microstructure of an Mg98.5Zn0.5Y1 alloy prepared by directional solidi cation (DS), synchronized with a long-period (LPSO) structure were systematically investigated using high-resolution transmission electron microscopy (HRTEM) and high-angle annular darkeld scanning transmission electron microscopy. The formation of 14H-type LPSO was observed to be accompanied by stacking faults. The lamellar 14H-type LPSO structure and stacking faults were both formed on (0001)α-Mg habit plane and grew along [1210]α-Mg direction in Mg98.5Zn0.5Y1 alloy prepared by DS. These ndings demonstrated that the stacking faults have a great effect on crystal growth in LPSO structure. The stacking faults nucleation were proposed to explain the growth of LPSO in DS. For the DS polycrystals, the LPSO exhibited a lamellar shape, whose unit cell was composed of two twin-related building blocks (ABCA-type and ACBA-type) which determined the physical and chemical properties of Mg98.5Zn0.5Y1 alloy. There were three atomic layers between two building blocks. The clusters were observed in the 14H-type LPSO which played an important role on building blocks. Furthermore, the two building blocks arranged in opposite shear direction is 68.7°. Based on the present study, an atom model Mg142Zn12Y16, which considered as the characteristic structure of 14H-type LPSO in Mg98.5Zn0.5Y1 alloy prepared by DS, was constructed. The atomic model were veri ed by simulation. The simulated diffraction patterns were consistent with the experimental pattern. [doi:10.2320/matertrans.M2016440]

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The Microstructure of Mg&lt;sub&gt;98.5&lt;/sub&gt;Zn&lt;sub&gt;0.5&lt;/sub&gt;Y&lt;sub&gt;1&lt;/sub&gt; Alloy with Long-Period Stacking Ordered Structure