Dresden 2006 – wissenschaftliches Programm

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MM: Metall- und Materialphysik

MM 14: Hydrogen in Metals I

MM 14.4: Vortrag

Dienstag, 28. März 2006, 11:00–11:15, IFW D

Local resolved hydrogen detection in technical alloys — •Christian Lenk, Matz Haaks, and Karl Maier — Helmholtz Institut für Strahlen- und Kernphysik, Universität Bonn, Nußalle 14-16 , D-53115 Bonn, Germany

The weldable aluminium alloy AA6013 used in aircraft construction shows during cyclic load in a corrosive medium an increased crack growth speed compared with deformation under normal atmosphere, as well as a slower annealing of point defects in the plastic zone. One assumes this behaviour is due to the uptake and diffusion of hydrogen during crack growth. This hypothesis has to be confirmed with an analytical detection of hydrogen in the plastic zone. For that purpose chips in the micrometer scale were cut from the sample in vacuum and in-situ heated under UHV conditions. The following increase of the partial pressure of hydrogen is recorded with a mass spectrometer. As a proof of principle, a sample made of a NiCu-alloy was loaded with a deuterium-concentration-structure. The distribution of the deuterium concentration was confirmed by the experiment.