2022 Fiscal Year Final Research Report
Theory development of kink formation and strengthening through interdisciplinary collaboration
| Project Area | Materials science on mille-feullie structure -Developement of next-generation structural materials guided by a new strengthen principle- |
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| Project/Area Number |
18H05481
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
中島 英治 九州大学, 総合理工学研究院, 教授 (80180280)
SVADLENKA KAREL 京都大学, 理学研究科, 准教授 (60572188)
稲邑 朋也 東京工業大学, 科学技術創成研究院, 教授 (60361771)
垂水 竜一 大阪大学, 大学院基礎工学研究科, 教授 (30362643)
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| Project Period (FY) |
2018-06-29 – 2023-03-31
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| Keywords | ミルフィーユ構造 / キンク形成 / キンク強化 / 回位 / 微分幾何学 / マグネシウム合金 |
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| Outline of Final Research Achievements |
Based on the crystal geometry, we theoretically derived that the generation of a disclination is inevitable during the formation of ridge kinks. This result was also verified by experiments using high-precision crystal orientation analysis. We also succeeded in quantifying the Flank vector of the disclination based on the new theory by unifying the lattice-defect theory of dislocation and disclination based on differential geometry. Furthermore, from the viewpoint of kink strengthening, we theoretically demonstrated that, in addition to the contribution of the elastic strain field of the dislocation, the energy increment due to the generation of the disclination acts as a deformation resistance. In collaboration with other researchers in our group, we found a unique phenomenon in which the solute-atom-enriched kink interface moves with a Portevin-Le Chatelier effect during room-temperature deformation after kink formation in the LPSO phase.
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| Free Research Field |
材料強度学，材料組織学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究は，硬質層と軟質層から成るミルフィーユ構造物質におけるキンク形成とキンク強化に対し，理論的な説明を与える意義を持つと同時に，微分幾何学に基づいて転位論と回位論を統一する新格子欠陥理論を構築したことにより，材料の力学特性を連続体力学として扱う分野に対し，汎用性の高い理論的枠組みを提供する。さらに，LPSO型マグネシウム合金をはじめとするミルフィーユ構造材料の実用化に対し，キンクを積極的に導入した材料強化手法の利用に対して，設計指針となり得る有益な知見を与えている。
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