In this work, Molecular Dynamics (MD) simulation is employed to investigate femtosecond laser ablation of copper, with an emphasis on the understanding of the mechanism of phase change during laser ablation. Laser induced heat transfer, melting, surface evaporation, and material ablation are studied. Theoretically, it has been suggested that under intense femtosecond laser irradiation, the material undergoes a volumetric phase change process; its maximum temperature can be close to or even above the thermodynamic critical point. The MD simulations allow us to determine the transient temperature history of the irradiated material and to reveal the exact phase change process, which explains the mechanisms of femtosecond laser ablation. A finite difference calculation is also performed, which is used to compare results of heating and melting prior to a significant amount of material being ablated.
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Molecular Dynamics Study of Phase Change Mechanisms During Femtosecond Laser Ablation
Changrui Cheng,
Changrui Cheng
School of Mechanical Engineering, Purdue University
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Ihtesham H. Chowdhury
Ihtesham H. Chowdhury
School of Mechanical Engineering, Purdue University
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Xianfan Xu
Changrui Cheng
School of Mechanical Engineering, Purdue University
Ihtesham H. Chowdhury
School of Mechanical Engineering, Purdue University
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division August 4, 2003; revision received June 3, 2004. Associate Editor: C. P. Grigoropoulos.
J. Heat Transfer. Oct 2004, 126(5): 727-734 (8 pages)
Published Online: November 16, 2004
Article history
Received:
August 4, 2003
Revised:
June 3, 2004
Online:
November 16, 2004
Citation
Xu, X., Cheng , C., and Chowdhury, I. H. (November 16, 2004). "Molecular Dynamics Study of Phase Change Mechanisms During Femtosecond Laser Ablation ." ASME. J. Heat Transfer. October 2004; 126(5): 727–734. https://doi.org/10.1115/1.1797011
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