| Project/Area Number |
26630009
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Materials/Mechanics of materials
|
|---|
| Research Institution | Kyoto University |
|---|
Principal Investigator |
Sumigawa Takashi 京都大学, 工学(系)研究科(研究院), 准教授 (80403989)
|
|---|
| Project Period (FY) |
2014-04-01 – 2016-03-31
|
| Project Status |
Completed (Fiscal Year 2015)
|
| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
|
|---|
| Keywords | ナノ / マイクロ / 疲労 / 金属 / 両振り / 共振 / 高サイクル / 単結晶 / 固執すべり帯 / 突き出し/入り込み |
|---|
| Outline of Final Research Achievements |
In order to investigate the fatigue behavior of nano-scale metal, a resonant fatigue experiment is developed. In a single crystal gold specimen that possesses a test section with a width of submicron-order, crystallographic slip bands appear on the surface by fatigue. The slip bands are brought about by the activation of a slip system with the maximum resolved shear stress amplitude. The critical value for the formation is evaluated to be more than 150 MPa which is more than 6 times larger than those of persistent slip band (PSB). Cross-sectional FE-SEM observation elucidates that extrusion/intrusion with a width of approximately 60 nm is formed on the surface at the slip bands. Although the morphology of the slip bands is similar to that of PSBs in a bulk counterpart, the width is extremely narrower (bulk: larger than 1 μm).
|
