Article In-situ transmission electron microscopy investigation of the deformation mechanism in CoCrNi and CoCrNiSi0.3 nanopillars

Cheng-Ling Tai ; Jhen-De You ; Jia-Jun Chen ; Shu-Cheng Liang ; Tsai-Fu Chung ; Yo-Lun Yang ; Seiichiro Ii SAMURAI ORCID (National Institute for Materials ScienceROR) ; Takahito Ohmura SAMURAI ORCID (National Institute for Materials ScienceROR) ; Xiaoyang Zheng ; Chih-Yuan Chen ; Jer-Ren Yang

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Cheng-Ling Tai, Jhen-De You, Jia-Jun Chen, Shu-Cheng Liang, Tsai-Fu Chung, Yo-Lun Yang, Seiichiro Ii, Takahito Ohmura, Xiaoyang Zheng, Chih-Yuan Chen, Jer-Ren Yang. In-situ transmission electron microscopy investigation of the deformation mechanism in CoCrNi and CoCrNiSi0.3 nanopillars. Scripta Materialia. 2024, 255 (), 116405. https://doi.org/10.1016/j.scriptamat.2024.116405

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(abstract)

CoCrNi and CoCrNiSi0.3 nanopillars exhibited distinct deformation behaviors under in-situ compression experiments with a strain rate of 2×10-3 s-1 in a transmission electron microscope. The former was mainly deformed through slip-dislocations and the formation of slip-bands with edges extending to the nanopillar’s boundaries; in contrast, the latter was primarily deformed by twinning and partitioned by deformation nanotwins, with different variants intersecting each other to form closed nano-blocks. Si addition not only enhanced the solid solution strengthening effect but also facilitated the formation of nanotwins, resulting in a delayed first strain burst in the CoCrNiSi0.3 nanopillar at a strain of 9.6 % with strength 39 % higher than that in CoCrNi at a strain of 7.1 % during the in-situ deformation. In addition, closed nano-blocks effectively strengthened the CoCrNiSi0.3 nanopillar, which possessed strength 24 % higher than that of the CoCrNi nanopillar at the same strain of about 20 %.

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Keyword: In-situ compression transmission electron microscopy, CoCrNi nanopillar, Silicon addition, Deformation nanotwins, Dislocations

Date published: 2024-10-15

Publisher: Elsevier BV

Journal:

  • Scripta Materialia (ISSN: 13596462) vol. 255 116405

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Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5005

First published URL: https://doi.org/10.1016/j.scriptamat.2024.116405

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Updated at: 2025-10-21 15:50:50 +0900

Published on MDR: 2025-10-21 15:43:34 +0900

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