1. Department of Mechanical Engineering, Osaka University, Suita, Osaka 565-0871, Japan.
2. Center for Materials Processing and Tribology, Purdue University, West Lafayette, IN 47907-2023, USA.
3. Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, India.
4. Special Warfare and Expeditionary Systems Department, Naval Surface Warfare Center, Crane Division, Crane, IN 47552, USA.