Étude sur la définition du terme "amorphe" par l'analyse comparative de rubans de Pd82 Si18 en termes de production, structure, microstructure, qualité et propriétés mécaniques

Abstract : Since their discovery, an important research work has been developed on the production, the structure, the microstructure, the properties and the applications of amorphous metallic alloys. However, the question of what is exactly meant by the term "amorphous" is not considered in most of the reported studies. As a matter of fact, there exist no real glasses representing a perfect disorder, as there exist no real crystals with a perfectly ordered structure. It is thus difficult to give a precise definition without giving the limitations in scale and in detection of this non-crystallinity. The aim the study is an interrogation, in the case of a specific alloy, on the term "amorphous" as a function of the two directions of reference given above (the scale and the technique). This study thus contains an analysis of the conditions of synthesis of amorphous samples of similar compositions. Furthermore, complementary detection techniques of their differences at the scale of the structure and microstructure have been used. Samples of Pd82Si18 of different thickness have been produced by melt-spinning with different parameters, such as the rotation speed of the wheel, the pressure of the gas, the dimensions of the nozzle, the quenching temperature and the existence or not of a heat treatment of the melt before quench. The samples have been analysed by various techniques such as diffraction of standard X rays and of neutrons, small angle neutrons scattering, transmission electron microscopy, calorimetry, mechanical tests and fractography by scanning electron microscopy
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Cuimin Bao. Étude sur la définition du terme "amorphe" par l'analyse comparative de rubans de Pd82 Si18 en termes de production, structure, microstructure, qualité et propriétés mécaniques. Autre. Institut National Polytechnique de Lorraine, 2007. Français. ⟨NNT : 2007INPL068N⟩. ⟨tel-01752900⟩

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