Surfaces et films minces d'alliages métalliques complexes

Abstract : After an introductive chapter on complex metallic alloys and surfaces, the thesis is divided into two distinct parts. The first part (Chap.II) concerns the structural determination of the 2-fold surface of d-Al-Cu-Co quasicrystal, by using LEED and STM. The results show (i) that the experimental terraces correspond to dense and Al-rich terminations -the element with the lowest surface energy- and (ii) that this decagonal phase could be entropically stabilized. In the second part of the manuscript (Chap.III, IV and V), we apply a surface science approach to solve a technological bottleneck: the adherence of quasicrystalline coatings on metallic substrates. We propose to grow a buffer layer that would accommodate the differences between the two materials. For that purpose, the -Al4Cu9 phase is a good candidate as it shares electronic and structural properties with both substrate and coating. Hence, we synthesize model interfaces by using MBE, first by adsorption and annealing of Cu on the 5-f surface of i-Al-Cu-Fe quasicrystal and then in the Al on Cu(111) system. Photoemission, STM and LEED experiments, along with DFT calculations show that a coherent interface can be grown between the -Al4Cu9 surface alloy and both the Cu and the quasicrystal. Those fundamental results are successfully reproduced in the real world, by growing similar interfaces using magnetron sputterring (Chap.V)
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Thomas Duguet. Surfaces et films minces d'alliages métalliques complexes. Autre. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL048N⟩. ⟨tel-01748767⟩

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