“…It is reported that eutectic compounds are formed along grain boundaries in some types of Mg alloys (e.g., Mg-Al, 6,7) Mg-Al-Ca, 6,7) Mg-Al-Sr 8) and Mg-Al-Zn 9,10) ) fabricated by Thixomolding Ò process. According to Huang et al, solidification of the alloy ZW66 (Mg-5.52 mass%Zn-6.48 mass%Y), whose chemical composition is similar to that of Mg 96 Zn 2 Y 2 (Mg-5 mass%Zn-6.7 mass%Y), occurs in three stages: (1) first, the -Mg matrix is formed, (2) then, Mg 12 YZn is formed by the pseudobinary eutectic reaction, and (3) finally, Mg 3 Y 2 Zn 3 is formed by the same reaction.…”