1. 1) T. YAMAGATA, H. HARADA, S. NAKAZAWA, M. YAMAZAKI and Y. G. NAKAGAWA : Proc. the 5th Int. Symp. on Superalloys, ed. by M. GELL et al. (1984), p. 157
2. 3) T. YAMAGATA, H. HARADA, S. NAKAZAWA and M. YAMAZAKI : Trans. Iron Steel Inst. Jpn., 26 (1986), p. 638
3. 4) J. A. GOEBEL, F. S. PETTIT and G. W. GOWARD : Metall. Trans., 4 (1973), p. 261
4. 5) H. HARADA, M. YAMAZAKI, Y. KOIZUMI, N. SAKUMA, N. FURUYA and H. KAMIYA : Proc. Intern. Conf., "High Temperature Alloys for Gas Turbines 1982 ", Liege, Belgium (1982), p. 721
5. 6) G. J. SANTORO : Oxid. Met., 13 (1979), p. 405