Shenyang National Laboratory ior Materials Science;
Institute of Metal Research;
Chinese Academy of Sciences;
Shenyang 110016;
China;
Department of Materials Engineering;
Shenyang Institute of Aeronautical Engineering;
Shenyang 110034;
China;
Department of Materials Science and Engineering;
University of Illinois at Urbana-Champaign;
Urbana;
IL 61801;
USA;