13 September 2002 Light alloy upgrading by surface laser treatment
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Proceedings Volume 4760, High-Power Laser Ablation IV; (2002) https://doi.org/10.1117/12.482079
Event: International Symposium on High-Power Laser Ablation 2002, 2002, Taos, New Mexico, United States
Abstract
The excimer laser nitriding and carburizing process reported is developed to enhance the mechanical and chemical properties of aluminum alloys. An excimer laser beam is focused onto the alloy surface in a cell containing 1 bar nitrogen or propylene gas. Vapor plasma expands from the surface then dissociates and ionizes ambient gas. Nitrogen or carbon atoms from plasma in contact with the surface penetrate in depth due to plasma recoil action onto the target surface heated by the plasma. It is thus necessary to work with a sufficient laser fluence to create the plasma, but this fluence must be limited to prevent laser-induced surface roughness. The nitrogen or carbon concentration profiles are determined from nuclear analysis. Crystalline quality is evidenced by X Ray Diffraction (XRD) technique. Transmission Electron Microscopy (TEM) gives the in-depth microstructure. Fretting coefficient measurements exhibit a satisfying behavior for some experimental conditions. The polycrystalline nitride or carbide layer obtained is several micrometers thick and composed of pure A1N or Al4C3 (columnar microstructure) top layer standing on a diffusion layer.
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Francois Fariaut, Chantal Boulmer-Leborgne, Caroline Andreazza-Vignolle, Thierry Sauvage, Cecile Langlade, Michel Frainais, "Light alloy upgrading by surface laser treatment", Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); doi: 10.1117/12.482079; https://doi.org/10.1117/12.482079
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