1. Institut für Materialphysik; Universität Göttingen; D-37077 Göttingen Germany
2. PRAXAIR Surface Technologies GmbH; D-40880 Ratingen Germany
3. Department of Mechanical Engineering; Helmut Schmidt University of the Federal Armed Forces; D-22039 Hamburg Germany
4. Department of Materials Engineering; Tarbiat Modares University; PO Box 14115-143 Tehran Iran
5. Department of Mechanical and Aerospace Engineering; University of Central Florida; Orlando FL 32186-2450 USA