The types and structures of the intermetallic phases in a cast Mg−4Al−15Gd−4Y−1Zn alloy
作者： Shuhui Lv , Yanwei Li , Xiaoling Lü , Fanzhi Meng , Qiang Yang
DOI: 10.1016/J.JALLCOM.2017.10.093
关键词:
摘要: Abstract The types and structures of the intermetallic phases formed during solidification in an as-cast Mg−4Al−15Gd−4Y−1Zn alloy were systematically investigated detail using transmission electron microscopy (TEM). results indicate that both 14H- 18R-long period stacking-ordered (LPSO) are clearly different from conventional LPSO Mg−TM−RE (TM = transition metal) systems with order-disorder structures. Furthermore, these two occasionally coexisted each other following orientation relationship as (0014) 14H about 70.6° (0018) 18R [1 1 ¯ 00] //[1 . In addition, another six namely large small blocky on grain boundary, short long parallel plates near lamellae phase irregular profile 18R-LPSO found studied alloy. former three Mg 5 RE later 14H-LPSO, 4.8 Al 12 7.2 24 , respectively. Finally, special may be transformed //(111) Mg4.8Al12RE7.2 //[0 1]
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