1. K. KOBAYASHI, P. H. SHIGU and R. OZAKI, in Proceedings of the International Conference on Solidifeation and Casting, Sheffield, July 1977, p. 10.
2. A. HELLAWELL,Prog. Mater. Sci. 15 (1970) 20.
3. A. J. McLEODet al., J. Cryst. Growth 19 (1973) 301.
4. Y. B. LIU, MS thesis, Jilin University of Technology, Changchun, China (1983).
5. C. G. ZHENGet al., Acta Metall. (in Chinese)18 (1982) 661.