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Type: Journal article
Title: Deformation-Induced Phase Transformations in Gold Nanoribbons with the 4H Phase
Author: Kismarahardja, A.
Wang, Z.
Li, D.
Wang, L.
Fu, L.
Chen, Y.
Fan, Z.
Chen, Y.
Han, X.
Zhang, H.
Liao, X.
Citation: ACS Nano, 2022; 16(2):3272-1-3279-8
Publisher: American Chemical Society (ACS)
Issue Date: 2022
ISSN: 1936-0851
Statement of
Ade Kismarahardja, Zhanxin Wang, Dongwei Li, Lihua Wang, Libo Fu, Yujie Chen, Zhanxi Fan, Ye Chen, Xiaodong Han, Hua Zhang, and Xiaozhou Liao
Abstract: The mechanical stability of metallic nanomaterials has been intensively studied due to their unique structures and promising applications. Although extensive investigations have been carried out on the deformation behaviors of metallic nanomaterials, the atomic-scale deformation mechanism of metallic nanomaterials with unconventional hexagonal structures remains unclear because of the lack of direct experimental observation. Here, we conduct an atomicresolution in situ tensile-straining transmission electron microscopy investigation on the deformation mechanism of gold nanoribbons with the 4H (hexagonal) phase. Our results reveal that plastic deformation in the 4H gold nanoribbons comprises three stages, in which both full and partial dislocations are involved. At the early deformation stage, plastic deformation is governed by full dislocation activities. Partial dislocations are subsequently activated in regions that have undergone full dislocation gliding, leading to phase transformation from the 4H phase to the face-centered cubic (FCC) phase. At the last stage of the deformation process, the volume fraction of the FCC phase increases, and full dislocation activities in the FCC regions also play an important role.
Keywords: deformation
in situ transmission electron microscopy
gold nanoribbon
phase transformation
hexagonal structure
Rights: © 2022 American Chemical Society
DOI: 10.1021/acsnano.1c11166
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Appears in Collections:Mechanical Engineering publications

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