MD simulation of nanoindentation on (001) and (111) surfaces of Ag–Ni multilayers |
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| Institution: | 1. College of Aerospace Engineering, Chongqing University, Chongqing 400044, PR China;2. The State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, PR China;3. School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), Brisbane, QLD 4001, Australia |
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| Abstract: | We perform MD simulations of the nanoindentation 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. |
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| Keywords: | MD simulation Nanoindentation Ag–Ni multilayers Inverse Hall–Petch relationship Modulation period |
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