Femtosecond laser sintering Al nanoparticles: A multiscale investigation of combined molecular dynamics simulation and two-temperature model

Jianwu Guo, Pengfei Ji*, Lan Jiang, Gen Lin, Yu Meng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

The sintering process of Al nanoparticles subject to femtosecond laser irradiation is investigated by using a multiscale approach combining molecular dynamics simulation at atomistic scale and two-temperature model at continuum scale. The temporal evolutions of electron temperature and lattice temperature, atomistic snapshot and structural transformation are calculated to reveal the detailed spatiotemporal information on femtosecond laser sintering Al nanoparticles. Moreover, by studying the temporal evolutions of mean square displacement, radius ratio, shrinkage rate and gyration radius during the sintering process, the impacts of absorbed laser fluence and laser pulse width on the sintering process of Al nanoparticles are probed. The absorbed laser fluence is found to crucially induce whether the Al nanoparticles are to be sintered. Furthermore, the critical absorbed laser fluence to trigger sintering is determined. Whereas, the laser pulse width is found to bring almost no distinctive differences on the process and result of Al nanoparticles sintering.

Original languageEnglish
Article number117682
JournalPowder Technology
Volume407
DOIs
Publication statusPublished - Jul 2022

Keywords

  • Femtosecond laser
  • Molecular dynamics
  • Nanoparticles
  • Sintering
  • Two-temperature model

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Guo, J., Ji, P., Jiang, L., Lin, G., & Meng, Y. (2022). Femtosecond laser sintering Al nanoparticles: A multiscale investigation of combined molecular dynamics simulation and two-temperature model. Powder Technology, 407, Article 117682. https://doi.org/10.1016/j.powtec.2022.117682