| Project/Area Number |
15K14162
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Structural/Functional materials
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| Research Institution | Kyoto University |
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Principal Investigator |
INUI HARUYUKI 京都大学, 工学(系)研究科(研究院), 教授 (30213135)
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| Project Period (FY) |
2015-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
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| Keywords | 異相界面 / 擬塑性 / マイクロクラック / マイクロピラー / 試験片サイズ依存性 / 動的その場観察 / 変形能 / 破壊靱性 |
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| Outline of Final Research Achievements |
Mechanisms as well as conditions for the appearance of interface-mediated pseudo-plasticity (IMPP) have been investigated with intermetallic compounds in the Fe-Zn system appearing on the surface of GA (galvanized) steel. Brittle failure is observed for micropillars of the combination of ductile Γ and brittle Γ1 phases when the compression axis is parallel to the interphase boundary. For micropillars of the combination of ductile ζ and brittle δ1p phases, on the other hand, plastic flow exceeding 10% plastic strain is observed with slip lines and microcracks being on the surface of the ζ and δ1p phases, respectively. This is clear indication that the δ1p phase can deform plastically through IMPP in the presence of the interphase boundary with the ζ phase, even though the δ1p phase itself alone is brittle. The phenomenon of IMPP occurs only when the thickness of the brittle δ1p phase is small and the critical thickness of the appearance of IMPP is found to be 5 μm.
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