Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1449261 | Acta Materialia | 2007 | 9 Pages |
Abstract
Deformation twinning is observed in numerous engineering and naturally occurring materials. However, a fundamental law for critical twinning stress has not yet emerged. We resolve this long-standing issue by integrating twin-energy pathways obtained via ab initio density functional theory with heterogeneous, dislocation-based twin nucleation models. Through a hierarchical theory, we establish an analytical expression that quantitatively predicts the critical twinning stress in face-centered cubic metals without any empiricism at any length scale. Our theory predicts a monotonic relation between the unstable twin stacking fault energy and twin nucleation stress revealing the physics of twinning.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
S. Kibey, J.B. Liu, D.D. Johnson, H. Sehitoglu,