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Micromachines 2018, 9(1), 26; doi:10.3390/mi9010026

Atomistic and Experimental Investigation of the Effect of Depth of Cut on Diamond Cutting of Cerium

Center for Precision Engineering, Harbin Institute of Technology, Harbin 150001, China
Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang 621908, China
Authors to whom correspondence should be addressed.
Received: 29 November 2017 / Revised: 3 January 2018 / Accepted: 12 January 2018 / Published: 13 January 2018
(This article belongs to the Special Issue Carbon Based Materials for MEMS/NEMS)
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The ultra-precision diamond cutting process exhibits strong size effects due to the ultra-small depth of cut that is comparable with the cutting edge radius. In the present work, we elucidate the underlying machining mechanisms of single crystal cerium under diamond cutting by means of molecular dynamics simulations, with an emphasis on the evaluation of the effect of depth of cut on the cutting process by using different depths of cut. Diamond cutting experiments of cerium with different depths of cut are also conducted. In particular for the smallest depth of cut of 0.2 nm, shallow cutting simulations varying the sharpness of the cutting edge demonstrate that an atomically sharp cutting edge leads to a smaller machining force and better machined surface quality than a blunt one. Simulation results indicate that dislocation slip is the dominant deformation mechanism of cerium under diamond cutting with each depth of cut. Furthermore, the analysis of the defect zone based on atomic radial distribution functions demonstrates that there are trivial phase transformations from γ-Ce to δ-Ce occurred in both the machined surface and the formed chip. It is found that there is a transition of material removal mode from plowing to cutting with the increase of the depth of cut, which is also consistent with the diamond cutting experiments of cerium with different depths of cut. View Full-Text
Keywords: cerium; diamond cutting; depth of cut; phase transformation; molecular dynamics cerium; diamond cutting; depth of cut; phase transformation; molecular dynamics

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Zhang, J.; Shuai, M.; Zheng, H.; Li, Y.; Jin, M.; Sun, T. Atomistic and Experimental Investigation of the Effect of Depth of Cut on Diamond Cutting of Cerium. Micromachines 2018, 9, 26.

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