期刊
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
卷 87, 期 -, 页码 213-219出版社
ELSEVIER
DOI: 10.1016/j.physe.2016.10.019
关键词
2NN MEAM; Ti-V multilayer; Nano-indentation; Nanotwins; Shear loop; Prismatic loop
资金
- National Natural Science Foundation of China [11332013, 11272364]
- Chongqing Graduate Student Research Innovation Project [CYB15029]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2015jcyjA50008]
We developed a second nearest-neighbor modified embedded-atom method potential for binary Ti-V system. The potential parameters were identified by fitting the lattice parameter, cohesive energy and elastic constants of CsCl-type TiV, and further validated by reproducing the fundamental physical and mechanical properties of Ti-V systems with other crystal structures. In addition, we also performed molecular dynamics simulations of nano-indentation processes of pure Ti film, pure V film, and two kinds of four-layer Ti-V films, V-Ti-V-Ti and Ti-V-Ti-V. We found that the indentation force-depth curve for the pure V film turns flat at an indentation depth of 2.8 nm, where a prismatic loop was observed. Such prismatic loop is not found in the V/Ti/V/Ti multilayer because the thickness of each layer is insufficient for the formation of such prismatic loops, which accounts for the increase of stress in the multilayer.
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