Tensile tests were performed on iron nanopillars oriented along [001] and [110] directions at a constant temperature of 300 K through molecular dynamics simulations with an embedded-atom interatomic potential for iron. The nanopillars were stretched until yielding to investigate the onset of their plastic deformation behaviors. Yielding was found to occur through two different mechanisms for [001] and [110] tensions. In the former case, plastic deformation is initiated by dislocation nucleation at the edges of the nanopillar, whereas in the latter case by phase transformation inside the nanopillar. The details during the onset of plastic deformation under the two different orientations were analyzed. The varying mechanisms during plastic deformation initiation are bound to influence the mechanical behavior of such nanoscale materials, especially those strongly textured.
参考文献
| [1] | J. R. Greer;W. C. Oliver;W. D. Nix .Size dependence of mechanical properties of gold at the micron scale in the absence of strain gradients[J].Acta materialia,2005(6):1821-1830. |
| [2] | M.F.HORSTEMEYER;M.I.BASKES;S.J.PLIMPTON .LENGTH SCALE AND TIME SCALE EFFECTS ON THE PLASTIC FLOW OF FCC METALS[J].Acta materialia,2001(20):4363-4374. |
| [3] | J. Diao;K. Gall;M. L. Dunn .Atomistic simulations of the yielding of gold nanowires[J].Acta materialia,2006(3):643-653. |
| [4] | Y. Mishin;M.J. Mehl;D.A. Papaconstantopoulos .Phase stability in the Fe-Ni system: Investigation by first-principles calculations and atomistic simulations[J].Acta materialia,2005(15):4029-4041. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%