Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1498785 | Scripta Materialia | 2013 | 4 Pages |
Abstract
Tensile-loading molecular dynamics simulations show that nanocrystalline SiC not only becomes ductile, but can be superplastically deformed at room temperature when grain sizes are reduced to d ∼ 2 nm. The calculated strain rate sensitivity, 0.67, implies a superplastic ceramic able to attain strains of up to 1000% at room temperature and typical strain rates (∼10−2 s−1). The origin of the superplasticity is linked to an unusually steep rise in creep rate to 106 s−1 for d = 2 nm. The results explain recent observations in SiC nanowires and suggest novel opportunities for structural ceramics.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
J.Y. Zhang, Z.D. Sha, P.S. Branicio, Y.W. Zhang, V. Sorkin, Q.X. Pei, D.J. Srolovitz,