[1] Nussbaum A I. Light Met Age, 1996; 6: 41 [2] Frederick P S, Bradley N L, Erickson S C. Ady Mater ProcInc Met Prog, 1988; 10: 53 [3] Flemings M C. Metall Trans, 1992; 22B: 269 [4] Flemings M C, Rick R G, Young K P. Mater Sci Eng, 1976;25: 103 [5] Malachi P, Kenney. Cast Hands, 1994; 15: 327 [6] Serve S C. Light Met Age, 1996; 6: 36 [7] Zhang K, Liu G J, Xu J, Zhang Y Z, Fan J Z, Shi L K. ChinJ Rare Met, 1998; 22. 333(张奎,刘国钧,徐骏,张永忠,樊建中,石力开。稀有金属,1998:22:333)