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.
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Synecek, V., Lasek, J., Bartuska, P., Simerská, M. (1989). Structure of Laser Modified Surface Layers of AlZn Alloys. In: Hašek, J. (eds) X-Ray and Neutron Structure Analysis in Materials Science. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0767-9_32
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DOI: https://doi.org/10.1007/978-1-4613-0767-9_32
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