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
|
Project Status |
Completed (Fiscal Year 2015)
|
Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
|
Keywords | ナノ構造 / 結晶粒界 / 空孔型欠陥 / 結晶格子収縮 / 相転移 / 擬弾性 / ナノ材料 / 金属物性 / 格子欠陥 / 表面・界面物性 |
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.
|
Report
(4 results)
Research Products
(20 results)