| Budget Amount *help |
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2023: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2021: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
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| Outline of Final Research Achievements |
The acceleration mechanism of the creep-fatigue damage of heat-resistant alloys under harsh condition at elevated temperature was quantitatively clarified from the viewpoint of strain-induced anisotropic diffusion of atoms and vacancies. Accumulation process of vacancies around grain boundaries and heterointerfaces was explained by the modified Arrhenius equation by considering the local decrease in the activation energy of the self-diffusion of component elements. The diffusion and accumulation of vacancies was found to be drastically accelerated by the local strain. The accumulation was quantitatively related to the orderliness of atomic alignment and thus, the strength of grain boundaries and thus, lifetime of intergranular cracking was successfully predicted.
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