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MM: Fachverband Metall- und Materialphysik

MM 47: SYM Hydrogen in Materials: New Developments V

MM 47.1: Talk

Friday, February 29, 2008, 10:15–10:35, H 1058

Mechanisms and thermodynamics of hydrogen embrittlement in metals — •Reiner Kirchheim — Institute for Materials Physics, University of Goettingen, Germany

Depending on temperature, hydrogen concentration, its diffusion coefficient and its terminal solubility different mechanisms of hydrogen embrittlement are relevant. Some of them are dealing with the ease of generating new surfaces (cracks) or dislocations in the presence of hydrogen. The formation energy of these defects as well as their mobility depends on the chemical potential of hydrogen. This relationship is discussed in the framework of a generalized Gibbs adsorption theory.