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- W2337247130 abstract "Abstract We present a systematic atomic scale analysis of the structural evolution of long-period-stacking-ordered (LPSO) structures in the (i) α-Mg matrix and in the (ii) interdendritic LPSO phase of an Mg 97 Y 2 Zn 1 (at. %) alloy annealed at 500 °C, using high resolution high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). Various types of metastable LPSO building block clusters have been observed in both regions. The thermodynamic phase stabilities computed by density-functional-theory calculations explain the diversity of the LPSO structures which are distinguished by their different arrangements of the Y/Zn enriched LPSO building blocks that have a local fcc stacking sequence on the close packed planes. A direct evidence of the transformation from 18R to 14H is presented. This finding suggests that LPSO structures can change their separation distance — quantified by the number of α-Mg layers between them — at a low energy penalty by generating the necessary Shockley partial dislocation on a specific glide plane. Based on our results the most probable transformation sequence of LPSO precipitate plates in the α-Mg matrix is: single building block → various metastable LPSO building block clusters → 14H, and the most probable transformation sequence in the interdendritic LPSO phase is: 18R→ various metastable LPSO building block clusters → 14H. The thermodynamically most stable structures in both the α-Mg matrix and the interdendritic LPSO phase are a mixture of 14H and α-Mg." @default.
- W2337247130 created "2016-06-24" @default.
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- W2337247130 date "2016-06-01" @default.
- W2337247130 modified "2023-10-17" @default.
- W2337247130 title "The role of metastable LPSO building block clusters in phase transformations of an Mg-Y-Zn alloy" @default.
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- W2337247130 doi "https://doi.org/10.1016/j.actamat.2016.04.016" @default.
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