1. Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
2. ALCOA Professor of Physical Metallurgy, Pittsburgh, PA, USA
3. School of Electronics and Information Technology, Sun Yat-sen University−Carnegie Mellon University Joint Institute of Engineering, Sun-Yat Sen University, Guangzhou, China
4. Sun Yat-sen Univeristy−Carnegie Mellon University Shunde International Joint Research Institute, Foshan, China