Abstract: magnesium alloys have been extensively applied in the field of aeronautics and space, transportation and electric devices, thanks to their high specific strength, specific stiffness and good processing and machinery ability. Unfortunately, magnesium alloys bear relatively low absolute strength, which seriously hinders their application as structural components. In recent years, employing rear earth element to enhance the strength of magnesium alloys has been a research hot spot, especially the research of mg-Zn-Y alloy. In mg-Zn-Y alloy, the variation of m(Y)/m(Zn) ratio will lead to the alteration of the strengthening phase. When m(Y)/m(Zn) ratio exceeds 1, a unique phase, named as long-period ordered stacking phase (LPSO), was found in mg-Zn-Y alloy, which possesses complete coherent interface with α-mg matrix, both structural and chemical order, and rich of Y and/or Zn. In compared with other secondary phases, the LPSO phase is superior in hardness, thermal stability, dam-ping property, creep resistance and modulus. Accordingly, the impact of this novel structural strengthening phase on the mechanical properties of magnesium alloys has aroused numerous interests of researchers, and become the focus of research on the strengthening and toughening of magnesium alloys. Recent researches are mostly concentrate on preparing magnesium alloys containing LPSO phase by means of rapid solidification powder metallurgy, copper mold casting, melt stripping and so forth; exploring the effect of LPSO phase on the properties of magnesium alloys by changing the types, amounts and proportions of solute atoms; improving the properties of magnesium alloys by regulating the amount, size and distribution of LPSO phase through heat treatment, extrusion and rolling processes. Concerning the research of microstructure of the LPSO phase, including the arrangement of each atom in the LPSO phase structure, and their specific location, first principle calculation, electoral electron diffraction (SADP), high resolution transmission (HRTEm) and high angle annular dark field image scanning electron microscope (HAADF-STEm) have been introduced in these studies, and a well-developed LPSO phase structure model has been established. A breakthrough has been achieved in the study of the movement of atoms in the LPSO phase structure during the solidification and deformation of magnesium alloys in recent years. In the early 21st century, the yield strength and elongation of the mg97Zn1Y2 (atom fraction)alloys prepared by rapid solidification and hot extrusion reached 610 mPa and 5%, respectively, and these excellent mechanical properties were attributed to the nanoscale LPSO phase. In thisarticle, we provide a detailed review on the formation mechanism, type of LPSO phase and alloy system with LPSO phase in magnesium alloys, as well as the order of structure and chemical composition in LPSO, and a deep analysis on the mechanism of enhancing strength, plasticity, creep resistance and high damping performance of magnesium alloys by LPSO phase. We also summarize the impact of the preparation process of LPSO contained magnesium alloys on their properties. Finally, we look forward the development direction of LPSO phase magnesium alloy.
李响, 毛萍莉, 王峰, 王志, 刘正, 周乐. 长周期有序堆垛相(LPSO)的研究现状及在镁合金中的作用[J]. 材料导报, 2019, 33(7): 1182-1189.
LI Xiang, mAO Pingli, WANG Feng, WANG Zhi, LIU Zheng, ZHOU Le. A Literature Review on Study of Long-period Stacking Ordered Phase and Its Effect on magnesium Alloys. Materials Reports, 2019, 33(7): 1182-1189.
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2019, Vol. 33 
