Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1580304 | Materials Science and Engineering: A | 2009 | 6 Pages |
Abstract
The grain size dependence of flow stress in Cu-2.7Â vol.%Al2O3 (15Â nm) composite with a bimodal structure was studied. It is shown that the yield strength obeys the Hall-Petch equation when an appropriate value of average grain size based on the “rule of mixture” is employed. The Hall-Petch constants (Ï0É and kÉ) are proportional to strain as É0.5. An equation for flow stress as a function of true strain and average grain size is proposed. The effect of alumina nanoparticles on the yield strength is shown to be related to large amounts of dislocations density.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Amir Afshar, A. Simchi,