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Research Papers: Micro-Nano Tribology

Phase Change of Carbon Atoms in Surface Layer Under Nanocutting During Diamond Lapping Process

[+] Author and Article Information
Ning Yang

Institute of Machinery
Manufacturing Technology,
China Academy of Engineering Physics,
Chengdu 610299, Sichuan, China
e-mail: yangning0706@126.com

Zhihui Xia

Institute of Machinery
Manufacturing Technology,
China Academy of Engineering Physics,
Chengdu 610299, Sichuan, China
e-mail: xzhui01@163.com

Xingjun Wang

Institute of Machinery
Manufacturing Technology,
China Academy of Engineering Physics,
Chengdu 610299, Sichuan, China
e-mail: wxj-my@163.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received March 27, 2017; final manuscript received September 27, 2017; published online December 4, 2017. Assoc. Editor: Sinan Muftu.

J. Tribol 140(3), 032002 (Dec 04, 2017) (6 pages) Paper No: TRIB-17-1112; doi: 10.1115/1.4038407 History: Received March 27, 2017; Revised September 27, 2017

Lapping is still an efficient and economical way in diamond shaping process, which is important in both industrial and scientific applications. It has been known that the material removal originates from the phase change or amorphization of diamond crystal carbon atoms that are chemically activated by stress, forming a top layer of amorphous carbon atoms. In this paper, the phase change of amorphous carbon atoms undergoing the nanocutting of amorphous layer during diamond lapping process is studied by molecular dynamics (MD) simulation. Two regions, the debris layer and cutting surface underneath, are studied. In the debris layer, the change of sp2 carbon atoms is directly affected by impact, while underneath the cutting surface the changes of carbon atoms are almost not affected; the change speed of amorphous carbon atoms is higher than that of pristine crystal ones; the main phase change is transformation of sp3 into sp2; cutting depth to different extent affects the phase changes of sp3 and sp2 carbon atoms. Our study expands the understanding of diamond lapping process.

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Figures

Grahic Jump Location
Fig. 1

The schematic of the MD model

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Fig. 2

The output of nanocutting process of the MD simulation system

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Fig. 3

Snapshots of the nanocutting simulation at (a) 25 ps, (b) 75 ps with (d) partial enlarged detail, and (c) 125 ps

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Fig. 4

Time evolution of the percentage of sp phase in cutting debris layer

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Fig. 5

Time evolution of the percentage of sp2 phase in cutting debris layer

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Fig. 6

Time evolution of the percentage of sp3 phase in cutting debris layer

Grahic Jump Location
Fig. 7

Time evolution of the percentage of sp phase underneath the cutting surface

Grahic Jump Location
Fig. 8

Time evolution of the percentage of sp2 phase underneath the cutting surface

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Fig. 9

Time evolution of the percentage of sp3 phase underneath the cutting surface

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