期刊
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
卷 74, 期 -, 页码 481-488出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physe.2015.08.020
关键词
MD simulation; Nanoindentation; Ag-Ni multilayers; Inverse Hall-Petch relationship; Modulation period
资金
- National Natural Science Foundation of China [11332013, 11272364]
- Chongqing Graduate Student Research Innovation Project [CYB15029]
- Challenging Exploratory Research [15K14117]
- JSPS and CAS under Japan-China Scientific Cooperation Program
- Shorai Foundation for Science and Technology
- [15H04114]
We perform MD simulations of the nanoinclentation on (001) and (111) surfaces of Ag-Ni multilayers with different modulation periods, and find that both the hardness and maximum force increase with the increase of modulation period, in agreement with the inverse Hall-Petch relation. A prismatic partial dislocation loop is observed in the Ni(111)/Ag(111) sample when the modulation period is relatively large. We also find that misfit dislocation network shows a square shape for the Ni(111)/Ag(111) interface, while a triangle shape for the Ni(001)/Ag(001) interface. The pyramidal defect zones are also observed in Ni(001)/Ag(001) sample, while the intersecting stacking faults are observed in Ni(111)/Ag(111) sample after dislocation traversing interface. The results offer insights into the nanoindentation behaviors in metallic multilayers, which should be important for clarifying strengthening mechanism in many other multilayers. (C) 2015 Elsevier B.V. All rights reserved.
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