Abstract
In the excimer laser carburizing process reported here, aluminum alloy samples have been treated in a propylene atmosphere, producing aluminum carbide surface layers. The layers have been characterized by nuclear reaction analysis that has shown carbon incorporation. X-ray diffraction at grazing incidence has evidenced aluminum carbide (Al4C3) phase. This study helps the understanding of the incorporation mechanisms of carbon in a surface. A micro-thermocapillary effect induced by heterogeneous surface formation has been evidenced. This original mass-transport phenomenon is very efficient in improving the carbon incorporation yield and hence in obtaining carbide layers several μm in thickness with a reduced laser pulse number. In order to obtain this micro-thermocapillary effect, the binary diagram of ceramic compounds must contain a peritectic.
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65.20.+w; 52.38.Mf; 52.50.Jm
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Fariaut, F., Boulmer-Leborgne, C., Semmar, N. et al. High-speed mass-transport phenomena during carburization of aluminum alloy by laser plasma treatment. Appl. Phys. A 83, 95–101 (2006). https://doi.org/10.1007/s00339-005-3461-4
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DOI: https://doi.org/10.1007/s00339-005-3461-4