作者机构:Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang110016, China
相关基金:Acknowledgements This work was supported by the National Natural Science Foundation of China (Nos. 50621091, 50701044 and 50890171), the Ministry of Science and Technology (No. 2005CB623604) and the National High Teehnology Research and Development Program of China (No. 2007AA03Z352).