| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Outline of Final Research Achievements |
The quantitative evaluation of the spatial distribution of grain boundaries which predominantly affected to fracture and corrosion in polycrystalline metallic materials can be achieved using fractal analysis. It was clarified that the fractal dimension of grain boundary spatial distribution is proportional to the grain boundary density which determined by the length of specific type grain boundaries per unit area. This result provides the fundamental knowledge of the control method of grain boundary spatial distribution. This study revealed that the control of segregation embrittlement, fatigue fracture, intergranular corrosion and electrical resistivity can be achieved by the grain boundary spatial distribution control.
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