| Project/Area Number |
03402045
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Physical properties of metals
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| Research Institution | Kyoto University |
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Principal Investigator |
MIURA Sei Kyoto Univ., Faculty of Eng., Professor, 工学部, 教授 (00066169)
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| Co-Investigator(Kenkyū-buntansha) |
KATO Hiroyuki Kyoto Univ., Fac. of Eng., Ass. Instructor, 工学部, 助手 (80224533)
ONAKA Susumu Kyoto Univ., Fac. of Eng., Ass. Instructor, 工学部, 助手 (40194576)
HASHIMOTO Satoshi Kyoto Univ., Fac. of Eng., Ass. Professor, 工学部, 助教授 (50127122)
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| Project Period (FY) |
1991 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥16,500,000 (Direct Cost: ¥16,500,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1991: ¥14,900,000 (Direct Cost: ¥14,900,000)
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| Keywords | Triple Line / Bicrystal / Tricrystal / Grain Boundary / Interphase Boundary / Creep / Fatigue / Intergranular Fracture / 二相ステンレス鋼 / 異相界面 / 界面すべり / 粒界疲労 / 粒界構造 / 粒界会合部 / 対応格子 / 粒界すべり / 中間温度ぜひ性 / 高温変形 / 粒界三重線 / 三重線fold / すべり帯 / 変形帯 / 応力伝達係数 / 不均一変形 |
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| Research Abstract |
The purpose of this project is to understand the structures of grain boundaries and boundary nodes (triple lines) necessary for strengthening of polycrystals. To achieve the purpose, we have studied roles of a grain boundary and a triple line in deformation and fracture from experiments employing tricrystals. Mains results obtained are summarized as follows.
1. We have grown single, bi-and tri-crystals of metals and alloys, and studied deformation and fracture behavior of the crystals by tensile, creep and fatigue tests. Localized deformation and formation and propagation of cracks at and around the grain boundaries and triple lines have been quantitatively and systematically studied including the effects of orientations of the grain boundaries and triple lines. We have revealed contribution of the triple lines to deformation and fracture and its temperature dependence, and presented the structures of grain boundaries and triple lines necessary for the strengthening of materials.
2. We have adopted tricrystals consisting of so called special boundaries as main specimens. The same triple lines with the triple lines in the tricrystals have been found in recrystallized copper bicrystals. We have shown the application of the results obtained using the tricrystals to the discussion of mechanical properties of polycrystals.
3. Considering the importance of multi-phase materials as practical structural materials, effects of intrphase boundaries on mechanical properties have been studied. We have (gamma/alpha) stainess bicrystals by diffusion bonding and investigated the constraint of grain deformation and the superplastic flow at the interphase boundaries.
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