Abstract
In this work, the spherical nanoindentation of FeNi3 crystal was simulated by molecular dynamics (MD) for (0 1 0), (1 1 0) and (1 1 1) surfaces to study the origin of pop-in phenomena at the atomistic level. Simulated results demonstrate that the critical load, indentation modulus as well as dislocation nucleation processes are strongly dependent upon crystallographic orientations. The pop-in behaviors observed in nanoindentation are associated with dislocation reactions. The first pop-in event indicates the homogeneous nucleation of the 1/6<1 1 2>-type partial dislocations. Activated partial dislocations can transform into dislocation locks through complex dislocation reactions.
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