Abstract
In this study, a comprehensive analysis of microstructural features, morphology, crystal structures, and interface structures of long-period stacking ordered (LPSO) structures in a non-equilibrium Mg97Zn1Y1.6Ca0.4 alloy cast in a steel mold was carried out. The addition of Ca element plays an important role in the refinement of LPSO structure. The result reveals new poly-types including 20H F2F2F4, 60R \((\mathrm{F}2\mathrm{F}3\bar{\mathrm{F}}3)_{3}\), and 66H \(\mathrm{F}2\mathrm{F}3\bar{\mathrm{F}}\) 3F2(F6)4 featuring a 6-Mg structure, alongside the prevalent 18R and 14H LPSO structures. The incoherent interface between 20H and the Mg matrix is split into two dislocation arrays, leading to the formation of a segment of 60R1. Moreover, the superstructure 116L, designated as (F2)18F4, is formed through the ordered distribution of F4 stacking faults in 18R.
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Acknowledgments
This work is supported by the open research fund of Songshan Lake Materials Laboratory (No. 2022SLABFN08), Guangxi Science and Technology Base and Talents Special Project (Nos. Guike AD20297034 and AD21220053), the National Natural Science Foundation of China (No. 51801214 and 52171021), the Research Start-up Funding from Guangxi University of Science and Technology (No. 03200150), the Middle-aged and Young Teachers’ Basic Ability Promotion Project of Guangxi (No. 2022KY0329).
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Qian-qian Jin Ph. D., Associate Researcher. His research interests mainly focus on the transmission electron microscopy of new crystal structures and interface defects in magnesium alloys.
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Jin, Qq., Tang, Zh., Xiao, Wl. et al. New poly-types of LPSO structures in a non-equilibrium Mg97Zn1Y1.6Ca0.4 alloy. China Foundry (2024). https://doi.org/10.1007/s41230-024-4036-3
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DOI: https://doi.org/10.1007/s41230-024-4036-3