Mécanismes fondamentaux du traitement de surfaces par bombardements électroniques pulsés : application aux matériaux métalliques et intermétalliques

Abstract : High-Current Pulsed Electron Beam (HCPEB) is a recently developed technique for surface treatment of materials. The high-density electron pulses of short durations induce dynamic temperature fields in the surface layers giving rise to superfast heating, possible melting and evaporating. This is followed by a rapid solidification and cooling of the material surface. In addition, a dynamic stress field is formed that causes intense deformation in the material sub-layers. The development and research work carried out using the HCPEB technique have been reviewed in this thesis by underlying its effects under the "melting", "heating" and "evaporating" treatment modes. At first, different physical models for the HCPEB treatment of materials under the three different treatment modes have been proposed. Subsequently, the intriguing surface modifications associated with the HCPEB treatment were detailed. Finally, the potential applications of the HCPEB technique to improve the materials? properties have been pointed out. Under all the three treatment modes, HCPEB treatment is proved to be an efficient way to modify the surface of metallic and intermetallic materials to taylor their properties. Overall, this review clearly demonstrate that the high potential of the HCPEB technique can be better achieved by a good control of the processing parameter in order to treat the sample surfaces under the most appropriate mode
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Jianxin Zou. Mécanismes fondamentaux du traitement de surfaces par bombardements électroniques pulsés : application aux matériaux métalliques et intermétalliques. Matériaux. Université Paul Verlaine - Metz, 2007. Français. ⟨NNT : 2007METZ018S⟩. ⟨tel-01775487⟩

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