| Budget Amount *help |
¥43,940,000 (Direct Cost: ¥33,800,000、Indirect Cost: ¥10,140,000)
Fiscal Year 2022: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Fiscal Year 2021: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Fiscal Year 2020: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Fiscal Year 2019: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Fiscal Year 2018: ¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
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| Outline of Final Research Achievements |
In forsterite (Mg2SiO4) + 10 vol% periclase (MgO) polycrystal, the slowest diffusing species, Si, is only present in the primary phase, forsterite. Uniaxial compression creep and grain growth experiments were carried out on this polycrystalline material. The results show that the diffusivities estimated from the creep and grain growth rates are the same, i.e. creep (superplastic deformation) and grain growth are governed by a common diffusion mechanism. In many rocks, the slowest diffusing species are in the primary phase. The viscosity of polycrystals during diffusion creep is determined by grain size and the common diffusivity. We finally proposed a grain size-time viscometer, which gives the viscosity from the time taken to reach that grain size.
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