Origin of lattice strain in nanocrystalline materials |
| |
| Authors: | W. Qin J. A. Szpunar |
| |
| Affiliation: | 1. Department of Metals and Materials Engineering , M.H. Wong Building, McGill University , 3610 University Street, Montreal, PQ, Canada H3A 2B2;2. Key Laboratory for Thin Film and Microfabrication of Ministry of Education , Research Institute for Micro/Nanometer Science and Technology, Shanghai Jiao Tong University , Shanghai 200030, China wenqin68@hotmail.com;4. Department of Metals and Materials Engineering , M.H. Wong Building, McGill University , 3610 University Street, Montreal, PQ, Canada H3A 2B2 |
| |
| Abstract: | A striking feature of nanocrystalline (NC) materials prepared by different techniques is the variation of lattice strain present in the crystallites. A simple model is proposed to account for this phenomenon, which allows the establishment of a quantitative relationship describing the dependence of the crystal lattice strain on the grain size. Good agreement between theoretical and experimental data indicates that the stress field, induced by the excess volume in grain boundaries, is the dominant source of the lattice strain. |
| |
| Keywords: | |
|
|
