Structural hierarchy as a key to complex phase selection in Al-Sm
Abstract
Investigating the unknown structure of the complex cubic phase, previously observed to crystallize from melt-spun amorphous Al–10 at.% Sm alloy, we determine the structure in full site-occupancy detail, highlighting several critical structural features that govern the far-from-equilibrium phase selection pathway. Using an efficient genetic algorithm combining molecular dynamics, density functional theory, and x-ray diffraction, the structure is clearly identified as body-centered cubic Im¯3m (No. 229) with ~140 atoms per cubic unit cell and a lattice parameter of 1.4 nm. The complex structure is further refined to elucidate the detailed site occupancy, revealing full Sm occupancy on 6b sites and split Sm/Al occupancy on 16f sites. Based on the refined site occupancy associated with the experimentally observed phase, we term this phase ε–Al60Sm11(bcc), corresponding to the limiting situation when all 16f sites are occupied by Sm. However, it should be recognized that the range of solubility enabled by split occupancy at Sm sites is an important feature in phase selection under experimental conditions, permitting an avenue for transition with little or no chemical partitioning. Our analysis shows that the ε–Al60Sm11(bcc) exhibits a “3-6-6-1” first-shell packing around Sm centers on 16f sites, the same dominant motif exhibited by the undercooled liquid. Here,more »
- Authors:
-
- Ames Lab., Ames, IA (United States)
- Ames Lab., Ames, IA (United States); Univ. of Science and Technology of China, Anhui (China)
- Univ. of Science and Technology of China, Anhui (China)
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Ames Lab. and Iowa State Univ., Ames, IA (United States); Univ. of Science and Technology of China, Anhui (China)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1408051
- Alternate Identifier(s):
- OSTI ID: 1399170
- Report Number(s):
- IS-J-9483
Journal ID: ISSN 2475-9953; PRMHAR; TRN: US1703161
- Grant/Contract Number:
- AC02-07CH11358; AC02-06CH11357; 201406340015; 11574289
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 1; Journal Issue: 5; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Ye, Z., Zhang, F., Sun, Y., Nguyen, M. C., Zhou, S. H., Zhou, L., Meng, F., Ott, Ryan T., Park, E., Besser, Matthew F., Kramer, Matthew J., Ding, Z. J., Mendelev, M. I., Wang, C. Z., Napolitano, Ralph E., and Ho, Kai -Ming. Structural hierarchy as a key to complex phase selection in Al-Sm. United States: N. p., 2017.
Web. doi:10.1103/PhysRevMaterials.1.055601.
Ye, Z., Zhang, F., Sun, Y., Nguyen, M. C., Zhou, S. H., Zhou, L., Meng, F., Ott, Ryan T., Park, E., Besser, Matthew F., Kramer, Matthew J., Ding, Z. J., Mendelev, M. I., Wang, C. Z., Napolitano, Ralph E., & Ho, Kai -Ming. Structural hierarchy as a key to complex phase selection in Al-Sm. United States. https://doi.org/10.1103/PhysRevMaterials.1.055601
Ye, Z., Zhang, F., Sun, Y., Nguyen, M. C., Zhou, S. H., Zhou, L., Meng, F., Ott, Ryan T., Park, E., Besser, Matthew F., Kramer, Matthew J., Ding, Z. J., Mendelev, M. I., Wang, C. Z., Napolitano, Ralph E., and Ho, Kai -Ming. Thu .
"Structural hierarchy as a key to complex phase selection in Al-Sm". United States. https://doi.org/10.1103/PhysRevMaterials.1.055601. https://www.osti.gov/servlets/purl/1408051.
@article{osti_1408051,
title = {Structural hierarchy as a key to complex phase selection in Al-Sm},
author = {Ye, Z. and Zhang, F. and Sun, Y. and Nguyen, M. C. and Zhou, S. H. and Zhou, L. and Meng, F. and Ott, Ryan T. and Park, E. and Besser, Matthew F. and Kramer, Matthew J. and Ding, Z. J. and Mendelev, M. I. and Wang, C. Z. and Napolitano, Ralph E. and Ho, Kai -Ming},
abstractNote = {Investigating the unknown structure of the complex cubic phase, previously observed to crystallize from melt-spun amorphous Al–10 at.% Sm alloy, we determine the structure in full site-occupancy detail, highlighting several critical structural features that govern the far-from-equilibrium phase selection pathway. Using an efficient genetic algorithm combining molecular dynamics, density functional theory, and x-ray diffraction, the structure is clearly identified as body-centered cubic Im¯3m (No. 229) with ~140 atoms per cubic unit cell and a lattice parameter of 1.4 nm. The complex structure is further refined to elucidate the detailed site occupancy, revealing full Sm occupancy on 6b sites and split Sm/Al occupancy on 16f sites. Based on the refined site occupancy associated with the experimentally observed phase, we term this phase ε–Al60Sm11(bcc), corresponding to the limiting situation when all 16f sites are occupied by Sm. However, it should be recognized that the range of solubility enabled by split occupancy at Sm sites is an important feature in phase selection under experimental conditions, permitting an avenue for transition with little or no chemical partitioning. Our analysis shows that the ε–Al60Sm11(bcc) exhibits a “3-6-6-1” first-shell packing around Sm centers on 16f sites, the same dominant motif exhibited by the undercooled liquid. Here, the coincident motif supports the notion that liquid/glass ordering at high undercooling may give rise to topological invariants between the noncrystalline and crystalline states that provide kinetic pathways to metastable phases that are not accessible during near-equilibrium processing.},
doi = {10.1103/PhysRevMaterials.1.055601},
journal = {Physical Review Materials},
number = 5,
volume = 1,
place = {United States},
year = {Thu Oct 12 00:00:00 EDT 2017},
month = {Thu Oct 12 00:00:00 EDT 2017}
}
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