1. Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, USA
2. Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843, USA
3. School of Materials and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
4. Materials Science and Engineering Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
5. Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
6. Siberian Physical Technical Institute, Tomsk State University, Tomsk 634050, Russia