基金supported by the National Basic Research Program ("973" Program) of China (No.2011CB610402)the National Natural Science Foundation of China (Nos. 50901061 and 50971102)+1 种基金the fund of the State Key Laboratory of Solidification Processing in NWPU, China (Nos. 02-TZ-2008 and 36-TP-2009)the Programme of Introducing Talents of Discipline to Universities (No. 08040)