Evaluation of Interfacial Fracture Strength in Micro-Scale Components Combined with High-Voltage Environmental Electron Microscopy

Takahashi, Yoshihiro; Arai, Shigeo; Yamamoto, Yuta; Higuchi, Kenichi; Kondo, Hikaru; Kitagawa, Y.; Muto, Shunsuke; Tanaka, Nobuo

doi:10.1007/s11340-015-0008-2

Cited by 13 publications

(5 citation statements)

References 34 publications

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“…A gold thin wire was attached on the stage and approached a diamond tip on the opposite side. The root of the tip was connected with a silicon-fabricated force sensor [66]. The load-displacement curves were constructed from signals of the force sensor and from the displacement of the piezo actuator.…”

Section: Various Kinds Of Application Resultsmentioning

confidence: 99%

Progress in environmental high-voltage transmission electron microscopy for nanomaterials

Tanaka

Fujita

Takahashi

et al. 2020

Phil. Trans. R. Soc. A.

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A new environmental high-voltage transmission electron microscope (E-HVEM) was developed by Nagoya University in collaboration with JEOL Ltd. An open-type environmental cell was employed to enable in-situ observations of chemical reactions on catalyst particles as well as mechanical deformation in gaseous conditions. One of the reasons for success was the application of high-voltage transmission electron microscopy to environmental (in-situ) observations in the gas atmosphere because of high transmission of electrons through gas layers and thick samples. Knock-on damages to samples by high-energy electrons were carefully considered. In this paper, we describe the detailed design of the E-HVEM, recent developments and various applications. This article is part of a discussion meeting issue ‘Dynamic in situ microscopy relating structure and function'.

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Section: Various Kinds Of Application Resultsmentioning

confidence: 99%

Progress in environmental high-voltage transmission electron microscopy for nanomaterials

Tanaka

Fujita

Takahashi

et al. 2020

Phil. Trans. R. Soc. A.

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“…For instance, TEM observations or mechanical tests of a microstructure containing a single grain boundary (e.g., micropillars 19) and microbending beams 20,21) ) would be useful for this purpose.…”

Section: Discussionmentioning

confidence: 99%

Electrochemical Nanoindentation Study on Influence of Hydrogen on Local Mechanical Properties of Fcc Metals at Slow Strain Rate

2016

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“…The acceleration voltage of TEM was 1000 kV, and digital image recording was done at 30 frames/s. For more details of the experimental setups, see references (Tanaka et al, 2013, Takahashi et al, 2015.…”

Section: Methodsmentioning

confidence: 99%

“…These studies generally claim the validity of the criterion; the nucleation of interfacial fracture from the free-edge is governed by the near-edge singular stress field that extends less than 100 nm. On the other hand, our recent survey on a number of Si/Cu micro-components shows that the fracture strength expressed by the near-edge stress is too scattered to make a reliable judgement of environmental effect (Takahashi et al, 2015). These contradicting results motivated the authors to revisit the strength properties of the Si/Cu free-edge.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of interfacial fracture strength in micro-components with different free-edge shape

Takahashi

Aihara

Ashida

et al. 2016

Mechanical Engineering Journal

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The strength against interfacial fracture nucleation from the free-edge of micro-scale bimaterial cantilevers consisting of silicon (Si) and copper (Cu) components is evaluated by using specimens with different free-edge shape. The fracture strength of Type A (90°/90° edge) specimens represented by the near-edge stress normal to the interface () is significantly scattered. On the other hand, the fracture strength of Type B (135°/135° edge) specimens represented by the stress intensity factor of  shows very good agreement. This indicates that the introduction of a sharp wedge at the free-edge is an effective measure for the evaluation of fracture strength that is unique to the interface. Such characteristics are also found to be unaltered by the plasticity of Cu component. The advantage of Type B specimen is then applied to the evaluation of the effect of gaseous environment on the fracture strength. There is no eminent reduction of strength value in hydrogen (H 2 )-containing gas, indicating that Si/Cu interface is relatively resistant against hydrogen embrittlement.

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Evaluation of Interfacial Fracture Strength in Micro-Scale Components Combined with High-Voltage Environmental Electron Microscopy

Cited by 13 publications

References 34 publications

Progress in environmental high-voltage transmission electron microscopy for nanomaterials

Progress in environmental high-voltage transmission electron microscopy for nanomaterials

Electrochemical Nanoindentation Study on Influence of Hydrogen on Local Mechanical Properties of Fcc Metals at Slow Strain Rate

Evaluation of interfacial fracture strength in micro-components with different free-edge shape

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