Underlying mechanisms for unique elastic properties of nanocrystalline Au
| Autor: | K. Otuka, Hisanori Tanimoto, Eiji Kita, Seiji Sakai, Hiroshi Mizubayashi |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Materials science
Condensed matter physics business.industry Mechanical Engineering Young's modulus Electron Condensed Matter Physics Nanocrystalline material symbols.namesake Amplitude Optics Mechanics of Materials symbols Relative density General Materials Science Grain boundary Irradiation Elasticity (economics) business |
| Zdroj: | Materials Science and Engineering: A. 370:177-180 |
| ISSN: | 0921-5093 |
| Popis: | In order to get an insight into the grain boundaries (GBs) in nanocrystalline (n-) metal, we prepared the high-density n-Au with ρ / ρ 0 >99% by the gas-deposition method and carried out the vibrating reed measurements, where ρ / ρ 0 is the relative density referring to the bulk density. The strain amplitude dependence (SAMD) of the resonant frequency ( f ) and the internal friction ( Q −1 ) was measured for the strain ( e ) amplitude between 10 −6 and 2×10 −3 and for temperature between 5 and 300 K. No plastic deformations are detected for the present strain range, where f decreases for e up to 10 −4 and then turns to increase, showing saturation for e between 10 −4 and 2×10 −3 . The low temperature irradiation by 2 MeV electrons or 20 MeV protons causes an increase in the Young’s modulus at 6 K, which is surmised to reflect a modification of the anelastic process in the GB regions. In contrast, the SAMD of f is hardly modified by irradiation, suggesting that it is indicative of a collective motion of atoms in n-Au. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect