Berlin 2008 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

MM: Fachverband Metall- und Materialphysik

MM 37: Intermetallic Phases II

MM 37.1: Vortrag

Donnerstag, 28. Februar 2008, 10:15–10:30, H 0111

In situ electrochemical nanoindentation: A nanomechanical approach to environmental degradation of iron aluminium — •Afrooz Barnoush, Christian Bies, and Horst Vehoff — Saarland University, Departement of Materials Science, Bldg. D22. P.O. Box 151150, D-66041 Saarbruecken, Germany

New nanomechanical testing methods such as nanoindentation allow us to study mechanical properties and deformation processes on the nanoscale. However, engineering materials are employed and operated under corrosive environments which are not easy to simulate inside of sensitive instruments like the nanoindenter. This was the motivation for constructing a new in-situ electrochemical nanoindentation setup, which is used to study the effect of environment on the deformation of FeAl single crystals in comparison to other metals. Especially the effect of the environment and surface films on dislocation nucleation and multiplication should be studied. For this the electrochemical setup is integrated into a nanoindentation system. By changing the electrochemical potential, a variety of different environments are able to be simulated during the indentation tests. The results show strong influence of the environment on the mechanical properties. Furthermore, the environmental effects on dislocation nucleation inside the material are investigated by analyzing the yield point phenomena (pop-in) in load-displacement curves. Recent results will be presented in the talk.