4CHENG T T. The mechanism of grain refinement in TiAl alloys by boron addition- an alternative hypothesis[J]. Intermetallics, 2000, 8(1) :29-37.
5WU X. Review of alloy and process development of TiAl alloys[J]. Intermetallics,2006,14(10-11) :1 114-1 122.
6HU D. Effect of composition on grain refinement in TiAl-based al-loys[J]. Intermetallics, 2001,9(12) : 1 037-1 043.
7CLEMENS H, WALLGRAM W, KREMMER S, et al. Design of novel beta-solidifying TiAl alloys with adjustable beta/B2-phase fraction and excellent hot workability[J]. Advanced Engineering Materials, 2008, 10(8): 707-713.
8LI B H, CHEN Y Y, HOU Z Q, et al. Microstrueture and me- chanical properties of as-cast Ti-43Al-9V-0.3Y alloy[J]. Journal of Alloys and Compounds, 2009,473(1-2) :123-126.
9KONG F T, CHEN Y Y, LI B H. Influence of yttrium on the high temperature deformability of TiAl alloys[J].Materials Sci- ence and Engineering, 2009, A499(1-2) : 53-57.
10JUNG J Y, PARK J K, CHUN C H. Influence of Al content on cast microstructnres of Ti-Al intermetallie compounds[J]. Inter metallics, 1999,7(9):1 033-1 041.
