| Project Area | Rheology of disordered materials: Establishing Anankeon dynamics |
|---|
| Project/Area Number |
22H05042
|
|---|
| Research Category |
Grant-in-Aid for Transformative Research Areas (B)
|
| Allocation Type | Single-year Grants |
|---|
| Review Section |
Transformative Research Areas, Section (II)
|
|---|
| Research Institution | Toyohashi University of Technology |
|---|
Principal Investigator |
Adachi Nozomu 豊橋技術科学大学, 工学(系)研究科(研究院), 准教授 (00758724)
|
|---|
| Project Period (FY) |
2022-05-20 – 2025-03-31
|
| Project Status |
Completed (Fiscal Year 2024)
|
| Budget Amount *help |
¥53,300,000 (Direct Cost: ¥41,000,000、Indirect Cost: ¥12,300,000)
Fiscal Year 2024: ¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2023: ¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2022: ¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
|
|---|
| Keywords | 金属ガラス / 構造不規則系 / 塑性変形 / 変形機構 / 力学特性 / 弾塑性変形 / 構造解析 |
|---|
| Outline of Research at the Start |
材料の変形のし易さや強さ（力学特性）を意図的に制御するためには，材料の変形を原子レベルで理解することが必要不可欠である．不規則な原子構造を持つ金属ガラスは，変形中に時々刻々と複雑に構造を変えるため，変形を司る原子構造が明らかになっていない．本研究では，加工技術を駆使して単純な構造を持ち、且つ力学特性が異なる金属ガラスを新たに創製することで，力学特性と原子構造の高精度な比較を実現し，金属ガラスにおける変形を司る構造（アナンケオン）の解明を目指す．
|
| Outline of Final Research Achievements |
In this study, the structural factors that contribute to the activation of fundamental excitations (anankeons), which govern the deformation behavior of structurally disordered materials such as metallic glasses was investigated. Using a technique developed by the principal investigator, ductility was successfully introduced into metallic glasses. It was found that, in addition to free volume (atomic-scale voids previously identified as important for ductility in earlier studies); the ductile metallic glasses also contain a substantial amount of anti-free volume, a structure denser than the stable configuration. Furthermore, detailed investigation of the structural relaxation process revealed the presence of microscale elastic stress fields. These newly discovered structural factors correlate well with the observed ductility of metallic glasses and represent a significant advance toward enhancing the ductility of these materials.
|
| Academic Significance and Societal Importance of the Research Achievements |
構造不規則系材料は，ガラスやゲル，泡状物質など様々な分野で活用されている．本研究は，構造不規則系材料の中でも金属ガラスを対象とし，その変形機構や変形の制御に関する重要な成果が得られ，学術的意義は大きい．本研究で得られた成果を深化させることで，金属ガラスの変形機構の理解につながると期待される．これは，金属ガラス分野のみならず，他の構造不規則材料にも波及し，我々の身の回りに存在する様々な材料の開発に寄与し，社会的意義は大きい．
|
