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We investigated the formation and mechanical properties of Mg 97 Zn 1 RE 2 alloys with long-period stacking ordered (LPSO) structures by examining RE = Y, La, Ce, Pr, Sm, Nd, Gd, Dy, Ho, Er, Tb, Tm and Yb. The LPSO phase developed for RE = Y, Dy, Ho, Er, Gd, Tb and Tm. LPSO Mg-Zn-RE alloys are either type I, in which the LPSO phase forms during solidification: Mg-Zn-Y, Mg-Zn-Dy, Mg-Zn-Ho, Mg-Zn-Er and Mg-Zn-Tm, or type II, in which the LPSO phase is nonexistent in as-cast ingots but precipitates with soaking at 773 K: Mg-Zn-Gd and Mg-Zn-Tb. The criteria for REs that form an LPSO phase in Mg-Zn-RE alloys are discussed. Mg-Zn-RE alloys with an LPSO phase, which were worked by hot extrusion, include high strength both at ambient and elevated temperatures, and good ductility. Their tensile yield strength, ultimate strength and elongation were 342-377 MPa, 372-410MPa and 3-9%, respectively at ambient temperature, and 292-310MPa, 322-345 MPa and 4-13% at 473 K. The LPSO Mg-Zn-RE alloys are promising candidates for lightweight structural materials.

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Formation and Mechanical Properties of Mg&lt;SUB&gt;97&lt;/SUB&gt;Zn&lt;SUB&gt;1&lt;/SUB&gt;RE&lt;SUB&gt;2&lt;/SUB&gt; Alloys with Long-Period Stacking Ordered Structure