2023 Fiscal Year Final Research Report
Elucidation of strengthening mechanisms of small-scale metallic materials based on nanoscopic observation of deformation and fracture processes
| Project/Area Number |
21H01211
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 18010:Mechanics of materials and materials-related
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| Research Institution | Kyushu University (2023)
Osaka University (2021-2022) |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 材料強度学 / ナノ材料 / 薄膜 / 塑性変形 / 破壊 |
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| Outline of Final Research Achievements |
To clarify the correspondence between the macroscopic and microscopic mechanisms of deformation and fracture and strength of small-scale metallic materials, tensile, fracture toughness, and fatigue crack propagation experiments were conducted on submicrometer-thick freestanding copper thin films. The resistance to plastic deformation of the polycrystalline copper thin films depended on grain size as well as film thickness, and showed a tendency for grain boundary strengthening that varied with film thickness. The microscopic deformation and fracture processes in front of the crack depended on the microstructure, which in turn affected the macroscopic crack initiation strength and crack propagation properties.
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| Free Research Field |
材料強度学
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| Academic Significance and Societal Importance of the Research Achievements |
材料の微視組織は変形・破壊の微視的過程と強度に強く影響を及ぼし，これが巨視的スケールにまで発達することで強度が発現する．しかし，微小金属材料においては変形・破壊の微視的過程そのものが解明されておらず，微小金属材料における強度の発現機構の理解は不十分である．本研究の成果は薄膜材料における変形・破壊の微視的過程を明らかにし，巨視的強度の発現機構について新たな知見を与えるものである．これらの知見は，微小金属材料の強度を確保するための材料設計指針を提供するとともに，微小金属材料を部材として用いるマイクロ・ナノデバイスや電子機器の強度設計基準を提供するものであり，学術的にも工業的にも重要なものである．
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