Shenyang National Laboratory for Materials Science;
Institute of Metal Research;
Chinese Academy of Sciences;
Shenyang 110016;
China;
Laboratory for Non-linear Mechanics of Continuous Media;
Institute of Mechanics;
Chinese Academy of Sciences Beijing 100080;
China;
Department of Mechanical and Aerospace Engineering;
University of California;
San Diego;
La Jolla;
CA 920930-0411;
USA;