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Réactivité et propriétés mécaniques des interfaces entre un alliage Al-Si et un renfort Fe ou Ti

Abstract : The objective of this work is to establish the relationships between interface chemistry and mechanical properties in bimetallic assemblies. It proves that the mechanisms which control the development of an interface between Al-Si alloy and titanium or ferrous reinforcement have a major influence on the mechanical properties of this interface. The mechanical characterization of these interfaces is performed by a 4-point bending test on the bimetallic plates elaborated by hot dip aluminizing on which a stiffener is joined by bonding or overmolding. The chemistry evolution of the interfacial reaction zone is induced by a heat treatment at 535 °C at different reaction times. The characterization of reaction zones and the crack paths is performed by X-ray diffraction and electron probe microanalysis. Before heat treatment, the analysis of mechanical tests performed on Fe/A-S7G03 interfaces leads to a value for the energy release rate of 23 J/m2 which corresponds to a crack propagation in the η- Al5Fe2 (Si) phase. As regards the Ti/A-S7G03 interfaces, their strength did not allow a crack propagation under the test conditions. After a heat treatment at 535°C, the Fe/A-S7G03 interfaces are weakened by the growth mechanism of interfacial reaction layer which leads to the appearance of Kirkendall voids within it. Conversely, in the case of Ti/A-S7G03 interfaces, the heat treatment is not associated with any weakening of the interfacial zone because of a different growth mechanism.
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Miao Zhe. Réactivité et propriétés mécaniques des interfaces entre un alliage Al-Si et un renfort Fe ou Ti. Alimentation et Nutrition. Université Claude Bernard - Lyon I, 2011. Français. ⟨NNT : 2011LYO10079⟩. ⟨tel-00648832⟩

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