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説明:

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 %.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: In-situ compression transmission electron microscopy, CoCrNi nanopillar, Silicon addition, Deformation nanotwins, Dislocations

刊行年月日: 2024-10-15

出版者: Elsevier BV

掲載誌:

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

研究助成金:

原稿種別: 著者最終稿 (Accepted manuscript)

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

公開URL: https://doi.org/10.1016/j.scriptamat.2024.116405

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更新時刻: 2025-10-21 15:50:50 +0900

MDRでの公開時刻: 2025-10-21 15:43:34 +0900