Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1446130 | Acta Materialia | 2013 | 6 Pages |
Abstract
We report a significant entropic effect on creep of nanocrystalline metal using molecular dynamics. Our simulations reveal that the activation entropy may contribute a multiplicative factor of many orders of magnitude to the steady-state creep rate. The relationship between activation entropy and enthalpy obeys an empirical Meyer–Neldel compensation rule. The activation volume is found to decrease with increasing temperature for dislocation nucleation creep, which agrees well with experimental results. The study opens up an avenue for quantitatively discussing the entropic effects on various thermally activated deformations in nanocrystals.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Yun-Jiang Wang, Akio Ishii, Shigenobu Ogata,