Formation of a lamellar 14H-type long period stacking ordered structure in an as-cast Mg–Gd–Zn–Zr alloy
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A novel as-cast Mg96.82Gd2Zn1Zr0.18 alloy was produced by conventional ingot metallurgy. By scanning electron microscope and transmission electron microscope observations, its as-cast microstructure is mainly composed of the α′-Mg solid solution, the coherent fine-lamellae and the eutectic. The β-phase ((Mg,Zn)3Gd) as the second phase in eutectic has a face-center cubic structure. While, the coherent lamellae consist of the 2H–Mg and the 14H-type long period stacking ordered (LPSO) structure. At present, the lamellar 14H-type LPSO structure has first been observed within α′-Mg matrix in the as-cast Mg–Gd–Zn–Zr alloys. It can be concluded that the lamellar 14H-type LPSO structure within α′-Mg matrix is a special structure obviously different from α-Mg matrix (2H-type structure) in structure, composition, and formation condition.
KeywordsRare Earth Average Chemical Composition Differential Thermal Analysis Trace Long Period Stack Order Coherent Relationship
Thanks are given to the support from the National Nature Science Foundation (50471015) and the SEM and TEM Laboratories of Analytical and Testing Center of Shanghai Jiaotong University.
- 24.Gao Y, Wang QD, Gu JH et al (2008) J Alloys Compd. doi: https://doi.org/10.1016/j.jallcom.208.10.0003