| Project/Area Number |
15K18248
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Material processing/Microstructural control engineering
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| Research Institution | Ritsumeikan University |
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Principal Investigator |
Ota Mie 立命館大学, 理工学部, 助教 (30710587)
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| Co-Investigator(Renkei-kenkyūsha) |
AMEYAMA Kei 立命館大学, 理工学部, 教授 (10184243)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 組織制御 / 高強度高延性 / 超強加工 / 粉末冶金 / 調和組織制御 / 強度延性バランス / チタンおよびチタン合金 |
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| Outline of Final Research Achievements |
The harmonic structure was successfully created by controlled milling of fine-sized pure Ti powder via jet milling followed by spark plasma sintering. Spark plasma sintering of milled powder resulted in the formation of a “harmonic” structure wherein the severely deformed shell regions of the milled powders transformed to a three dimensional network of equiaxed fine-sized grains, enclosing the coarse-grained “core” areas. The pure Ti compacts with a harmonic structure exhibited a significant enhancement in the strength without compromising the ductility. The improved mechanical properties of the harmonic structure compacts were attributed to the specific topological distribution of high strength fine-grained “shell” and ductile coarse-grained “core” regions; as such a microstructure promotes uniform distribution of strain during plastic deformation and avoids the localized plastic deformation in the early stages of deformation.
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