Molecular Dynamics Simulation of the Ablation Process in Ultrashort Pulsed Laser Machining of Polycrystalline Diamond

Zeng Qiang Li; Jun Wang; Qi Wu

doi:10.4028/www.scientific.net/AMR.500.351

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 500Molecular Dynamics Simulation of the Ablation...

Molecular Dynamics Simulation of the Ablation Process in Ultrashort Pulsed Laser Machining of Polycrystalline Diamond

Abstract:

The mechanism of ultrashort pulsed laser ablation of polycrystalline diamond (PCD) is investigated using molecular dynamics simulation. The simulation model provides a detailed atomic-level description of the laser energy deposition to PCD specimens and is verified by an experiment using 300 fs laser irradiation of a PCD sample. It is found that grain boundaries play an important role in the laser ablation. Melting starts from the grain boundaries since the atoms in these regions have higher potential energy and are melted more easily than the perfect diamond. Non-homogeneous melting then takes place at these places, and the inner crystal grains melt more easily in liquid surroundings presented by the melting grain boundaries. Moreover, the interplay of the two processes, photomechanical spallation and evaporation, are found to account for material removal in ultrashort pulsed laser ablation of PCD.

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Periodical:

Advanced Materials Research (Volume 500)

Pages:

351-356

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.500.351

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Online since:

April 2012

Authors:

Zeng Qiang Li, Jun Wang, Qi Wu

Keywords:

Ablation, Molecular Dynamics (MD) Simulation, Polycrystalline Diamond, Ultrashort Pulsed Laser

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