• Discovery of new LPSO poly-types (20H, 60R, 66H) in Mg97Zn1Y1.6Ca0.4 alloy, expanding the known LPSO family.
• Ca addition refines LPSO structures, potentially improving mechanical properties and corrosion resistance.
• Detailed interface analysis reveals dislocation arrays and formation of 60R1 segment, enhancing understanding of LPSO growth mechanisms.
• Identification of superstructure 116L via ordered F4 stacking faults in 18R, providing insights into complex stacking sequences.
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