1. Institute of Materials Science; Technische Universität Darmstadt; Alarich-Weiss-Str. 2 D-64287 Darmstadt Germany
2. Fraunhofer Institute for Mechanics of Materials IWM; Woehlerstrasse 11 D-79108 Freiburg Germany
3. Forschungszentrum Jülich GmbH; Institute of Energy and Climate Research IEK-1: Materials Synthesis and Processing; Jülich D-52425 Germany