Journal
SCRIPTA MATERIALIA
Volume 211, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2022.114502
Keywords
Precipitation; annealing; Nanocrystalline materials; Grain boundary segregation; Grain boundary structure
Categories
Funding
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE) , under the Advanced Manufacturing Office [DE-EE0009114]
- National Science Foundation through the UC Irvine Materials Research Science and Engineering Center [DMR-2011967]
- National Science Foundation Center for Chemistry at the Space-Time Limit [CHE-0802913]
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Unique nanorod precipitates with a core-shell structure are found to nucleate from the grain boundaries of a bulk nanocrystalline Al-Ni-Y alloy. The local structure and chemistry of these features during annealing are studied. As annealing time increases, more nanorods transform to an ordered structure while the shell chemistry transitions from Y-rich to Ni-rich. The correlation between the nanorods and amorphous complexions is observed.
Unique nanorod precipitates with a core-shell structure are found to nucleate from the grain boundaries of a bulk nanocrystalline Al-Ni-Y alloy fabricated via powder consolidation, contributing significantly to stabilization and strengthening. The local structure, chemistry, and evolution of these features during an-nealing are reported here. In the as-consolidated state, the nanorods can be either structurally ordered or disordered, yet a consistent chemical patterning is found where the core is primarily Al plus C while the shell is enriched with Y. As annealing time increases, more nanorods transform to an ordered structure as they coarsen while the core composition remains unchanged. In contrast, the shell chemistry transitions from Y-rich to Ni-rich with longer annealing treatments, most likely due to the different diffusivities of Y and Ni in Al. Moreover, a spatial and chemical correlation between the nanorods and amorphous com-plexions is observed, suggesting that these complexions serve as preferential nucleation sites. (c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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