2001 Fiscal Year Final Research Report Summary
Structure and mechanical properties of rolled multi-layered films
| Project/Area Number |
12650651
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Physical properties of metals
|
|---|
| Research Institution | Iwate University |
|---|
Principal Investigator |
ECHIGOYA Jun-ichi Iwate University, Faculty of Engineering, Professor, 工学部, 教授 (00005539)
|
|---|
| Project Period (FY) |
2000 – 2001
|
| Keywords | multi-layered foil / structure / mechanical properties |
|---|
| Research Abstract |
Size, i.e., micro structural dimension, is an important factor to determine mechanical properties. Therefore, to investigate the size effect such as grain size and thickness of multi-layers is fundamental to understand and design advanced materials. We studied the size effect of mechanical properties in thin foils with multi-layered. Multi-layered foils were made by hot pressing and then cold rolling. The thickness of a layer of multi-layrers is controlled by the rolling rate. Tensile strength increases with the decrease of thickness of a layer and reaches a constant value even when the thickness is decreased. The shear modulus of components of multi-layered foils controlled the strength of foils, when the thickness of the component layer was less than 20 nm. The thickness dependence of strength was well documented by the Hall-Petch model when the thickness of the component layer was larger than 20 nm.
|
