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Interactions Hydrogène - Plasticité dans le Nickel et ses Alliages

Abstract : We evaluate the different contributions of the hydrogen-dislocation interactions to the plasticity of fcc materials in order to feed predictive models of stress corrosion cracking. Static strain ageing experiments are used to quantify the hardening contribution of solute drag by dislocations to the flow stress. We demonstrate the role of hydrogen transport by dislocations on the fracture mechanism. We model the influence of the screening of the elastic field of dislocations by hydrogen on elementary plasticity mechanisms and we conclude that the decrease of the cross slip ability arises from the combined action of elastic and core effects. The testing of single crystals shows that the major effect is on the cross slip mechanism. Tensile tests on polycrystals enlighten the diversity of macroscopic responses observed in alloys.
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Submitted on : Friday, November 12, 2010 - 4:36:44 PM
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  • HAL Id : tel-00535777, version 1


Gouenou Girardin. Interactions Hydrogène - Plasticité dans le Nickel et ses Alliages. Mécanique []. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2004. Français. ⟨tel-00535777⟩



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