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Structure of Laser Modified Surface Layers of AlZn Alloys

  • V. Synecek
  • J. Lasek
  • P. Bartuska
  • M. Simerská

Abstract

Specific features of laser treatment of metals arise from the possibility of supplying large amount of energy on a small area of metal surface1–4. The heat input is also substantially faster than its output by heat conduction of the material. Only very thin surface layers are therefore heated up during a locally short interval of laser exposure. Both the fraction of incident beam energy available for rapid heating and the rate of subsequent cooling determine the influence of laser treatment on the structure of material. The final structure is thus affected by both the optical (absorptivity) and the thermal (thermal conductivity and thermal diffusivity) properties of the material. The absorptivity of clean smooth solid metal surfaces is rather low (for polished aluminum at room temperature it is about two per cent only) and depends on both their temperature and the wavelength of laser radiation.

Keywords

Laser Treatment Heat Affected Zone Laser Welding Columnar Cell Laser Surface Melting 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • V. Synecek
    • 1
  • J. Lasek
    • 1
  • P. Bartuska
    • 1
  • M. Simerská
    • 1
  1. 1.Institute of PhysicsCzechoslovak Academy of SciencesPrague 6Czechoslovakia

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