2021 Fiscal Year Final Research Report
Investigation of the strain redistribution mechanism in titanium alloys using image-based crystal plasticity analysis
| Project/Area Number |
19K04983
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 26010:Metallic material properties-related
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| Research Institution | Kitami Institute of Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
光原 昌寿 九州大学, 総合理工学研究院, 准教授 (10514218)
眞山 剛 熊本大学, 大学院先端科学研究部(工), 准教授 (40333629)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 局所変形 / ひずみの再分配 / slip operation factor / 結晶塑性解析 / 力学的相互作用 / EBSD / チタン / HCP |
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| Outline of Final Research Achievements |
In titanium and its alloys, strain localization leading to the fracture is an important mechanism to understand. In this study, we attempted to explain the mechanism of strain localization at the crystal grain level observed in α titanium and dual phase titanium alloys by using the concept of “strain redistribution” between grains with different deformation resistance. The following results were obtained: (i) Strain localization and concentration in polycrystalline titanium were successfully explained by the concept of strain redistribution. (ii) While mechanical interactions between adjacent grains have been focused on as a mechanism of strain localization in titanium, strain redistribution occurs between a longer range of grains and affects the strain localization.
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| Free Research Field |
機械・機械材料、計算力学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では，構造材料としてのチタンの局所変形機構を，ひずみの再分配という概念を用いて説明した．このことは，チタンの破壊機構の理解に繋がるだけではなく，更なる高性能化の指針となる．また，本研究でひずみの再分配機構の調査のために開発した，すべり変形の起こりやすさの指標Slip operation factor（SOF）は，チタンに留まらず多結晶体の変形機構を調査するためのツールとして用いることができる．以上より，本研究の学術的意義，社会的意義が認められる．
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