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Atomic structure of gamma '' phase in Mg-Gd-Y-Ag alloy induced by Ag addition
Sha XC1; Xiao LR1; Chen XF(陈雪飞)2,3; Cheng GM4; Yu YD5; Yin DD6; Zhou H2

Mg-Gd based alloys are typical high strength magnesium alloys owing to their outstanding age hardening behavior. The mechanical strength of aged Mg-Gd alloys is enhanced by high density prismatic-shaped precipitates in Mg matrix. Moreover, the addition of Ag has been found to enhance the strength of Mg-Gd based alloys further by forming a plate-shaped precipitate, named as gamma '', on basal planes of Mg. However, the structure of this precipitate is not well understood due to the complex alloying system. In this work, the atomic structure of gamma '' phase is investigated using atomic-resolution high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). Based on the accurate atomic structure from three independent directions, e.g. in [0001](Mg), [110](Mg) and [010](Mg) zone axes, the unit cell of gamma '' is well established. The gamma '' phase has a hexagonal structure, and its lattice parameters are a = 0.55 nm and c = 0.42 nm. The orientation relationship between gamma '' phase and Mg matrix is (0001)(gamma '')//(0001)(Mg) and (gamma '')//(Mg).

KeywordMg alloys precipitation HAADF-STEM microstructural analysis
Indexed BySCI ; EI
WOS IDWOS:000466674400001
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Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Beijing Univ Technol, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China;
2.Nanjing Univ Sci & Technol, Nano & Heterogeneous Mat Ctr, Sch Mat Sci & Engineer, Nanjing 210094, Jiangsu, Peoples R China;
3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing, Peoples R China;
4.North Carolina State Univ, Dept Mech & Aerosp Engn, Raleigh, NC USA;
5.Harbin Univ Sci & Technol, Sch Mat Sci & Engn, Harbin, Heilongjiang, Peoples R China;
6.Southwest Jiaotong Univ, Sch Mat Sci & Engn, Key Lab Adv Technol Mat, Minist Educ, Chengdu, Sichuan, Peoples R China
Recommended Citation
GB/T 7714
Sha XC,Xiao LR,Chen XF,et al. Atomic structure of gamma '' phase in Mg-Gd-Y-Ag alloy induced by Ag addition[J]. PHILOSOPHICAL MAGAZINE,2019:13.
APA Sha XC.,Xiao LR.,Chen XF.,Cheng GM.,Yu YD.,...&Zhou H.(2019).Atomic structure of gamma '' phase in Mg-Gd-Y-Ag alloy induced by Ag addition.PHILOSOPHICAL MAGAZINE,13.
MLA Sha XC,et al."Atomic structure of gamma '' phase in Mg-Gd-Y-Ag alloy induced by Ag addition".PHILOSOPHICAL MAGAZINE (2019):13.
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