1. B. H. KEAR and H. G. F. WILSDORF,Trans. Metall. Soc. AIME 264 (1962) 267.
2. M. H. YOO, J. A. HORTON, and C. T. LIU,Acta Metall. 36 (1988) 2935.
3. PU ZHONGJIE, ZHU DONG, ZHU JING, CAI QIGONG and ZOU DONXU, in The Metallurgical Society 1989 Fall Meeting, Indianapolis, Indiana, 2?5 October, 1989.
4. S.-C. HUANG, and E. L. HALL,Met. Trans. 22A (1991) 427.
5. T. K. SINHAet al., J. Mater. Sci. 19 (1984) 1449.