1. 1) M. Yamaguchi, Y. Umakoshi, T. Kondo and G. Mima: Met. Trans., 2 (1971), 1293.
2. 2) Y. Umakoshi, M. Yamaguchi, T. Kondo and G. Mima: J. Japan Inst. Metals, 35 (1971), 223.
3. 3) D. Jaffrey and G. A. Chadwick: Trans. Met. Soc. AIME, 245 (1969), 2435.
4. 4) R. M. Anderson and P. D. Caton: J. Inst. Metals, 96 (1968), 108.
5. 5) A. V. Dean: J. Inst. Metals, 95 (1967), 79.