Structural hierarchy as a key to complex phase selection in Al-Sm

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

doi:10.1103/PhysRevMaterials.1.055601

Structural hierarchy as a key to complex phase selection in Al-Sm

Journal Article · Thu Oct 12 00:00:00 EDT 2017 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.1.055601· OSTI ID:1408051

Ye, Z. ^[1]; Zhang, F. ^[1]; Sun, Y. ^[2]; Nguyen, M. C. ^[1]; Zhou, S. H. ^[1]; Zhou, L. ^[1]; Meng, F. ^[1]; Ott, Ryan T. ^[1]; Park, E. ^[1]; Besser, Matthew F. ^[1]; Kramer, Matthew J. ^[1]; Ding, Z. J. ^[3]; Mendelev, M. I. ^[1]; Wang, C. Z. ^[1]; Napolitano, Ralph E. ^[4]; Ho, Kai -Ming ^[5]

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)

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.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-06CH11357; AC02-07CH11358

OSTI ID:: 1408051

Alternate ID(s):: OSTI ID: 1399170

Report Number(s):: IS-J--9483

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 5 Vol. 1; ISSN PRMHAR; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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