Molecular dynamics investigation of incipient plasticity during nanomachining of Cu (111) surface Online publication date: Sat, 07-Mar-2015
by Junjie Zhang; Tao Sun; Yongda Yan; Yingchun Liang; Shen Dong
International Journal of Nanomanufacturing (IJNM), Vol. 7, No. 5/6, 2011
Abstract: Large-scale molecular dynamics (MD) simulation of the probe-based mechanical nanomachining is performed to explore the dislocation activities governed incipient plasticity in single crystalline Cu (111) surface with a spherical probe. The atomic interactions between approximate 6 million Cu atoms are described by EAM potential. Simulation results show that in indentation process emergence of plastic deformation is accompanied with force drop phenomena caused by initial dislocation nucleation, and surface pile up pattern is dominantly determined by geometry of slip planes activated. It is indicated that the dislocation activity is the dominant deformation mechanisms in nanomachining of single crystal Cu. Three serial phases of dislocation motions during the following scratching process are observed. Furthermore, there are more kinds of defects generated in scratching process than in indentation process.
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