1. Department of Materials Science and Engineering and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA
2. Computational and Information Sciences Directorate, U.S. Army Research Laboratory, Aberdeen Proving Ground, Maryland 21005, USA
3. Institute of Materials Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany
4. Department of Mechanical Engineering, University of Mississippi, 201-B Carrier Hall, University, Mississippi 38677, USA