Campus Units
Materials Science and Engineering, Ames Laboratory
Document Type
Article
Publication Version
Accepted Manuscript
Publication Date
1-23-2020
Journal or Book Title
Materialia
First Page
100595
DOI
10.1016/j.mtla.2020.100595
Abstract
Competitive phase selection during devitrification of Al-Sm glassy alloys is investigated for compositions ranging from 9.0 to 14.1 at% Sm. The crystallization response under isothermal and constant-heating-rate treatments is observed to involve metastable phases that lie well beneath (energetically above) the equilibrium landscape. Certain phases have also been shown to contain particular sub-crystalline atomic motifs that may be present and even dominant in the undercooled liquid and glass. Experimentally observed structures and associated chemical variations are investigated within the context of comprehensive solution-based thermodynamic models and the corresponding relationship between driving force and chemical partitioning. It is found that initial selection of complex large-unit-cell intermetallic phases is largely governed by the energetics of the partitionless or nearly partitionless crystallization transition. Evidence from transmission electron microscopy and small-angle X-ray scattering further suggests that cooperative precipitation phenomena may be operative and instrumental in alleviating the excess solute burden, as might be expected under conditions of limited atomic transport.
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Copyright Owner
Elsevier Ltd.
Copyright Date
2020
Language
en
File Format
application/pdf
Recommended Citation
Meng, F. Q.; Zhou, S. H.; Ott, Ryan T.; Kramer, Matthew J.; and Napolitano, Ralph E., "Competitive devitrification and metastable phase selection in amorphous Al-Sm" (2020). Materials Science and Engineering Publications. 368.
https://lib.dr.iastate.edu/mse_pubs/368
Comments
This is a manuscript of an article published as Meng, F. Q., S. H. Zhou, R. T. Ott, M. J. Kramer, and R. E. Napolitano. "Competitive devitrification and metastable phase selection in amorphous Al-Sm." Materialia (2020): 100595. DOI: 10.1016/j.mtla.2020.100595. Posted with permission.