1. Fraunhofer Institute for Mechanics of Materials IWM, 79108 Freiburg, Germany
2. Karlsruhe Institute of Technology, Institute of Applied Materials - Reliability of Components and Systems IAM-ZBS, 76131 Karlsruhe, Germany
3. Johns Hopkins University, Department of Physics and Astronomy, Baltimore, Maryland 21218, United States
4. Freiburg Materials Research Center, 79104 Freiburg, Germany
5. BMW Group, 80788 München, Germany