| Budget Amount *help |
¥13,130,000 (Direct Cost: ¥10,100,000、Indirect Cost: ¥3,030,000)
Fiscal Year 2020: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2019: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2018: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
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| Outline of Final Research Achievements |
The fracture along grain boundaries (GBs), which is frequently observed in high-strength poly-crystalline materials subjected to hydrogen environments, has been qualitatively attributed to the hydrogen embrittlement (HE) of the GBs. Is the GB-HE theory correct? Motivated by this fundamental question, a quantitative GB-HE measurement method using a micro-specimen containing a single GB is studied in detail. The key point of the study is the hard coating layer attached locally to the specimen surface. With this procedure, it is confirmed that the amount of plastic deformation before the onset of GB fracture is effectively reduced. Further, an in-situ STEM-EELS analysis of GB hydrogen using a nano electron probe is conducted under a hydrogen environment.
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