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Observation of η-Al41Sm5 reveals motif-aware structural evolution in Al-Sm alloys
Scientific Reports
  • Zhuo Ye, Ames Laboratory
  • F. Meng, Ames Laboratory
  • Feng Zhang, Ames Laboratory
  • Yang Sun, Ames Laboratory and University of Science and Technology of China
  • L. Yang, Ames Laboratory
  • S. H. Zhou, Ames Laboratory
  • Ralph E. Napolitano, Iowa State University and Ames Laboratory
  • Mikhail I. Mendelev, Ames Laboratory
  • Ryan T. Ott, Ames Laboratory
  • Matthew J. Kramer, Ames Laboratory
  • Cai-Zhuang Wang, Ames Laboratory
  • Kai-Ming Ho, Iowa State University and Ames Laboratory
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Using an effective genetic algorithm, we uncover the structure of a metastable Al41Sm5 phase that supplements its family sharing similar short-range orders. The phase evolves upon heating an amorphous Al-9.7 at.% Sm ribbon, produced by melt-spinning. The dynamical phase selection is discussed with respect to the structural connections between the short-range packing motifs in the amorphous precursor and those observed in the selected phases. The phase elucidated here is one of several newly discovered large-unit-cell phases found to form during devitrification from the glass in this binary system, further illustrating the power and efficiency of our approach, the important role of structural hierarchy in phase selection, and the richness of the metastable phase landscape accessible from the glassy structure.


This article is published as Ye, Z., F. Meng, F. Zhang, Y. Sun, L. Yang, S. H. Zhou, R. E. Napolitano, M. I. Mendelev, R. T. Ott, M. J. Kramer, C. Z. Wang, and K. M. Ho. "Observation of η-Al 41 Sm 5 reveals motif-aware structural evolution in Al-Sm alloys." Scientific Reports 9, (2019): 6692. DOI: 10.1038/s41598-019-43079-9. Posted with permission.

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Zhuo Ye, F. Meng, Feng Zhang, Yang Sun, et al.. "Observation of η-Al41Sm5 reveals motif-aware structural evolution in Al-Sm alloys" Scientific Reports Vol. 9 (2019) p. 6692
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