2019 Fiscal Year Final Research Report
Mechanics of creep fracture in metallic nanostructures
| Project/Area Number |
17H01239
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Materials/Mechanics of materials
|
|---|
| Research Institution | Kyoto University |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
近藤 俊之 大阪大学, 工学研究科, 助教 (70735042)
|
|---|
| Project Period (FY) |
2017-04-01 – 2020-03-31
|
| Keywords | ナノ・マイクロ材料力学 / 微小材料強度学 / 破壊力学 / クリープ |
|---|
| Outline of Final Research Achievements |
This study aims to elucidate the creep mechanisms of metallic nanostructures and establish the mechanics dominating the creep fracture. We have developed in-situ SEM and TEM creep experiment methods for nanoscale specimens. Creep experiments were performed on nanoscale Au and Al single crystals. The results indicated that the size effect "smaller is stronger" is present in the creep properties, that the creep resistance is improved by introducing the nanoscale dislocation loops, and that the creep strength is weakened by the presence of notch.
|
| Free Research Field |
材料力学
|
| Academic Significance and Societal Importance of the Research Achievements |
微細構造物の構成要素として用いられる寸法がサブµmからnmオーダーの金属ナノ構造体では，クリープが主要な変形・破壊機構になる．しかし，金属ナノ構造体のクリープ現象の詳細は解明されていなかった．本研究成果は，典型的な金属ナノ構造体のクリープ特性，とりわけクリープ変形機構とクリープ破壊の力学に関する新たな知見を与えるものであり，ナノデバイスの長期信頼性設計に合理的な指針を提供するものである．
|
