Wang Jun Born in 1981, he received B.S. degree from Xi'an Technological University in 2006 and then pursuits M.S. degree at Northwestern Polytechnical University. His main research interest lies in the effects of B- and Y-addition on the microstructure and oxidation resistance of Nb-Ti- Si-based ultrahigh-temperature alloys. E-mail: wjunshanxi@ 163.com Corresponding author. Tel.: +86-29-88494873. E-mail address:xpguo@nwpu.edu.cn