Formation and characterization of microstructure of as-cast Mg–6Gd–4Y–xZn–0.5Zr (x = 0.3, 0.5 and 0.7 wt.%) alloys
- National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200240 (China)
Mg–6Gd–4Y–xZn–0.5Zr (x = 0.3, 0.5 and 0.7 wt.%) alloys were prepared via conventional ingot metallurgy (I/M) in this study. The as-cast microstructures of these alloys were established by X-ray diffraction (XRD) analyses, optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM) observations. Lamellar stacking order (SF) and 14H-type long period stacking order (LPSO) structure within α-Mg matrix are formed in the three as-cast alloys. The eutectic secondary phase is (Mg,Zn){sub 24}(Gd,Y){sub 5} for the alloy containing 0.3 wt.% Zn, while, it is (Mg,Zn){sub 3}(Gd,Y) for the alloys containing 0.5 wt.% Zn and 0.7 wt.% Zn. Moreover, X phase-(Mg,Zn){sub 12}(Gd,Y) is formed in the latter two as-cast alloys. - Highlights: • LPSO structure has first been found in as-cast Mg–6Gd–4Y–xZn–0.5Zr. • X-phase exists in as-cast Mg–6Gd–4Y–0.3(0.5)Zn–0.5Zr. • Zn content results in different β-phase in the studied alloys.
- OSTI ID:
- 22285044
- Journal Information:
- Materials Characterization, Vol. 79; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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