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- W2897631689 abstract "Abstract The magnesium-gadolinium (Mg–Gd) system provides an ideal model alloy for precipitation hardening. Evolution of precipitates in a Mg–16.2Gd–0.4Zr (wt.%) alloy during isothermal ageing from 150 °C to 300 °C was systemically studied using high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The widely accepted four-stage precipitation sequence of the Mg–Gd(–Zr) alloy system has been accordingly updated to: super-saturated solid solution (S.S.S.S.) → ordered solute clusters → GP zones → β′ → β F ' + tail-like hybrid structures → β1 → β. In addition to carefully revealing an updated precipitation sequence, new insights into the relationships amongst different precipitate phases were obtained and rationalised. (1) Solute clusters and GP zones form during the early stages of ageing and share the same structural unit; (2) Formation of β′ phase is accomplished via ordered stacking of zigzag GP zones along open= 10 1 ¯ 0 α; (3) Coarsening of β′ phase promotes the formation of β F ' phase and tail-like hybrid structures; (4) β F ' phase facilitates the nucleation of β1 phase; and (5) β1 and β phases maintain a low-energy Σ9 interface and β1 phase finally transforms to equilibrium β phase in situ. The precipitate evolution at the grain boundaries during ageing were also investigated and grain boundary precipitate free zones were observed in Mg–16.2Gd–0.4Zr alloy aged at 250 °C or above." @default.
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- W2897631689 date "2019-03-01" @default.
- W2897631689 modified "2023-10-17" @default.
- W2897631689 title "A detailed HAADF-STEM study of precipitate evolution in Mg–Gd alloy" @default.
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- W2897631689 doi "https://doi.org/10.1016/j.jallcom.2018.10.193" @default.
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