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

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2024-10-15 DOI:10.1016/j.scriptamat.2024.116405

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Abstract

CoCrNi and CoCrNiSi_0.3 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 CoCrNiSi_0.3 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 CoCrNiSi_0.3 nanopillar, which possessed strength 24 % higher than that of the CoCrNi nanopillar at the same strain of ∼20 %.

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钴铬镍和钴铬镍硅 0.3 纳米柱变形机制的原位透射电子显微镜研究

在透射电子显微镜下，钴铬镍和钴铬镍硅 0.3 纳米柱在应变率为 2 × 10-3 s-1 的原位压缩实验中表现出截然不同的变形行为。前者主要通过滑移位移变形，并形成边缘延伸至纳米柱边界的滑移带；相比之下，后者主要通过孪晶变形，并由变形纳米丝分割，不同的变体相互交错形成封闭的纳米块。硅的加入不仅增强了固溶强化效果，还促进了纳米细丝的形成，从而使 CoCrNiSi0.3 纳米柱在应变为 9.6% 时出现延迟的首次应变爆发，其强度比 CoCrNi 在原位变形过程中应变为 7.1% 时的强度高出 39%。此外，封闭纳米块有效增强了 CoCrNiSi0.3 纳米柱，在相同应变 ∼ 20 % 的情况下，其强度比 CoCrNi 纳米柱高 24 %。

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.