2015 Fiscal Year Final Research Report
Lattice Contraction and quasi-two phase state of nanocrystalline metal
| Project/Area Number |
25390027
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Nanomaterials engineering
|
|---|
| Research Institution | University of Tsukuba |
|---|
Principal Investigator |
|
|---|
| Research Collaborator |
XI Terigele
SATO Takatoshi
|
|---|
| Project Period (FY) |
2013-04-01 – 2016-03-31
|
| Keywords | ナノ構造 / 結晶粒界 / 空孔型欠陥 / 結晶格子収縮 / 相転移 |
|---|
| Outline of Final Research Achievements |
The origin of unique properties of nanocrystalline metals was investigated from various physical properties of nanocrystalline gold. The results indicated that abundant vacancy-type defects contained in the crystallites play an important role on stabilization of grain boundaries and a quasi-two phase state of crystallite and grain boundaries is brought out. A partial flow of the vacancy-type defects from the crystallites to the grain boundaries starts above 170 K and it triggers the glass-like transition of grain boundaries leading to the unique properties of nanocrystalline gold such as the large anelasticity above 200 K.
|
| Free Research Field |
ナノ構造物性
|
