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- W4309333416 abstract "Precipitates are critical in strengthening Mg-Gd-Y-Zn-Mn alloys. However, lack of sufficient atomic-scale characterization restricts further understanding of the precipitates. Therefore, in the present study, precipitates in the as-cast, solution-annealed, and isothermally aged (200 °C) Mg-Gd-Y-Zn-Mn alloy have been comprehensively examined on the atomic scale by aberration-corrected (Cs) high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM) combined with energy dispersive X-ray spectrometry (EDS). When observed in the [0001]α direction in the early-aged alloy for 6 min, uneven local rare earth solute clusters in the form of βH and βZ phases suggest a transition from βH to βZ. In the peak-aged alloy for 16 h, Mn atoms are found to segregate into the γ′/long-period stacking ordered (LPSO) phase and β′ phase, participating in their formation. In the over-aged alloys for 200 h, γ″ phase is detected with enrichment of Mn, coexisting with the γ′ and β′ phases. Furthermore, β″-like structures are observed, which may be defective βM or β′T as a result of their overlapping, thus providing a possible explanation for the controversy regarding the existence of the β″ phase. Our findings serve as evidence that deepens the understanding of the precipitates in Mg-Gd-Y-Zn-Mn alloys at the atomic level." @default.
- W4309333416 created "2022-11-26" @default.
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- W4309333416 date "2023-01-01" @default.
- W4309333416 modified "2023-09-29" @default.
- W4309333416 title "Atomic-scale characterization of the precipitates in a Mg-Gd-Y-Zn-Mn alloy using scanning transmission electron microscopy" @default.
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- W4309333416 doi "https://doi.org/10.1016/j.vacuum.2022.111668" @default.
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