On the atomic structure of γ″ phase in Mg-Zn-Gd alloy

Study on the planar segregation of solute atoms in Mg-Al-Gd alloy

“…The method for preparing TEM (HAADF-STEM) specimens and observation condition are the same as in our previous work [29]. The 3DAP data was taken by CAMECA LEAP 4000HR at 35 K. A pulse fraction of 20% and a pulse frequency of 200 kHz were applied.…”

Self-adapted clustering of solute atoms into a confined two-dimensional prismatic platelet with an ellipse-like quasi-unit cell

“…Compared with the basal precipitation behaviors, such as the Laves phase (Xie et al, 2018a), 00 phase (Nuttall et al, 1980;Xia et al, 2015;Gu et al, 2018;Xie et al, 2018b), or longperiod-stacking order phase (Yamasaki et al, 2007;Iikubo et al, 2012) in Mg alloys, the platelets precipitated in the prism planes usually exhibit a stronger strengthening effect (Nie, 2012). In this work, the Mg-In-Yb alloy shows an aginghardening maximum hardness of 63.3 HV, an $50% increase.…”

“…Icosahedral clustering, where a structure has a coordination number of 12, the highest stacking density and the lowest free energy of the system (Frank, 1952;Travesset, 2017), usually occurs in aged ternary or multicomponent alloy systems. Precipitation of high-density lamellar structures developed from initial solute icosahedral clusters is an effective way to enhance the strength of alloys such as the T 1 phase in Al-Li-Cu systems (Gao et al, 2015;Deng et al, 2017), the phase in Al-Cu-Mg-Ag systems (Auld et al, 1966;Kang et al, 2014) and the 00 phase in Mg-RE-Zn systems (Nuttall et al, 1980;Xia et al, 2015;Gu et al, 2018;Xie et al, 2018d). For face-centered cubic (f.c.c.)…”

Atomic Scale Investigation on Precipitates and Defects of Mg–RE Alloys: A Review

“…γ′ phase here is only found at peak aging condition. In addition, Gu et al investigated the atomic structure in Mg–Gd–Zn alloy. Both HAADF‐STEM and DFT calculations were both applied to identify the atomic scale structures.…”

“…Peng et al used DFT calculation to investigate the stability of Al 2 Y and Mg matrix interface. Gu et al applied DFT calculation to modify the γ″ phase structure. Gu et al carried out first principle calculation to understand the segregation behavior.…”