Growth and structural transitions of core-shell nanorods in nanocrystalline Al-Ni-Y

Lei, Tianjiao; Xu, Mingjie; Shin, Jungho; Gianola, Daniel S.; Rupert, Timothy J.

doi:10.1016/j.scriptamat.2022.114502

Growth and structural transitions of core-shell nanorods in nanocrystalline Al-Ni-Y

Journal Article · Tue Jan 11 00:00:00 EST 2022 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2022.114502· OSTI ID:1865847

Lei, Tianjiao ^[1]; Xu, Mingjie ^[2]; Shin, Jungho ^[3]; Gianola, Daniel S. ^[3]; Rupert, Timothy J. ^[2]

Univ. of California, Irvine, CA (United States); University of California Santa Barbara
Univ. of California, Irvine, CA (United States)
Univ. of California, Santa Barbara, CA (United States)

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 annealing 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. Furthermore, a spatial and chemical correlation between the nanorods and amorphous complexions is observed, suggesting that these complexions serve as preferential nucleation sites.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Santa Barbara, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office

Grant/Contract Number:: EE0009114

OSTI ID:: 1865847

Journal Information:: Scripta Materialia, Journal Name: Scripta Materialia Vol. 211; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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