Microstructures induced by excimer laser surface melting of the SiC p /Al metal matrix composite

D. S. Qian, X. L. Zhong, Y. Z. Yan, T. Hashimoto, Z. Liu

Research output: Contribution to journalArticlepeer-review


Laser surface melting (LSM) was carried out on the SiC p /Al metal matrix composite (MMC) using a KrF excimer laser with a fluence of 7 J/cm 2 . The re-solidification microstructure was characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM) equipped with energy dispersive X-ray detector, and X-ray diffraction (XRD) analysis. It was found that a 2.5 μm thick melted layer was formed in the near-surface region, in which dissolution of the intermetallics and removal of the SiC particles occurred. The thermal and material response upon laser irradiation was simulated using three models, i.e. analytical model, finite element model (FEM) and smoothed-particle hydrodynamics (SPH) model. The effect of SiC particles on the LSM process, the mechanism of the SiC removal and the re-solidification microstructures in the melted layer were discussed. The simulation results were in good agreement with the experimental results and contributed to the generic understanding of the re-solidification microstructures induced by ns-pulsed lasers.

Original languageEnglish
Pages (from-to)436-446
Number of pages11
JournalApplied Surface Science
Early online date31 Mar 2017
Publication statusPublished - 1 Aug 2017


  • Laser treatment
  • Microstructures
  • MMCs
  • Modelling


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