1. Department of Materials Science and Metallurgical Engineering; Universitat Politècnica de Catalunya; Campus Diagonal Besòs-EEBE; Barcelona 08019 Spain
2. Centre for Research in Multiscale Engineering of Barcelona; Universitat Politècnica de Catalunya; Campus Diagonal Besòs-EEBE; Barcelona 08019 Spain
3. Dr. I. Sapezanskaia, Dr. R. Kouitat, Prof. A. Redjaïmia Institut Jean Lamour UMR 7198 CNRS; Université de Lorraine; Nancy Cedex 54840 France