May 2000-May 2003, postdoctoral fellow, Department of Materials Science and Engineering, University of Michigan, USA; May 2003-June 2005, senior researcher, State Key Laboratory of New Metal Materials, University of Science and Technology Beijing, July 2005 to present. Professor, State Key Laboratory of New Metal Materials, University of Science and Technology Beijing, 2006/1-,Deputy Director, State Key Laboratory of New Metal Materials, University of Science and Technology Beijing, 2009/4-, Deputy Commander, Professor and Doctoral Supervisor, National Material Service Safety Science Center (to be determined).