Campus Units

Materials Science and Engineering, Ames Laboratory

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

3-2020

Journal or Book Title

Materialia

Volume

9

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.

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 9 (2020): 100595. DOI: 10.1016/j.mtla.2020.100595. Posted with permission.

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Copyright Owner

Elsevier Ltd.

Language

en

File Format

application/pdf

Available for download on Sunday, January 23, 2022

Published Version

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