| Budget Amount *help |
¥179,270,000 (Direct Cost: ¥137,900,000、Indirect Cost: ¥41,370,000)
Fiscal Year 2020: ¥21,970,000 (Direct Cost: ¥16,900,000、Indirect Cost: ¥5,070,000)
Fiscal Year 2019: ¥24,310,000 (Direct Cost: ¥18,700,000、Indirect Cost: ¥5,610,000)
Fiscal Year 2018: ¥33,930,000 (Direct Cost: ¥26,100,000、Indirect Cost: ¥7,830,000)
Fiscal Year 2017: ¥25,740,000 (Direct Cost: ¥19,800,000、Indirect Cost: ¥5,940,000)
Fiscal Year 2016: ¥73,320,000 (Direct Cost: ¥56,400,000、Indirect Cost: ¥16,920,000)
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| Outline of Final Research Achievements |
The motivation of this project was to achieve a breakthrough toward second-generation grain boundary engineering (GBE). For this purpose, we dealt with two major issues: (1) comprehensive understanding the mechanical response due to the interaction of grain boundary (GB) and dislocations, and (2) development of guiding principle for GB control of materials with high stacking fault energy. We have found with nanoindentation tests and TEM in-situ straining experiments for orientation-controlled bicrystals that GBs act as preferential sites for nucleation of dislocations, and succeeded in quantitative evaluation of the critical stresses for dislocation nucleation and for slip transmission across the GBs. Those critical stresses were found to depend on the GB structure. As for the issue (2), we developed the processing routes for introducing high frequency of low-energy GBs and found that the newly developed GBE achieved enhanced bulk properties like fatigue and corrosion resistance.
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