1. 1) K. Kimura, M. Masaki, M. Murayama and Y. Kako: Nippon Steel Tech. Rep., 85 (2002), 1.
2. 2) M. Tokita, M. Sasage and T. Takechi: Nippon Steel & Sumitomo Met. Tech. Rep., 106 (2014), 9.
3. 3) H. Murata: Titanium Zirconium (Jpn.), 40 (1987), 81.
4. 4) S. Kataoka, J. Kihara and T. Aizawa: J. Jpn. Soc. Technol. Plast., 34 (1993), 210.
5. 5) Y. Tabe, M. Fukuda and Y. Moriguchi: Proc. 1982 Japanese Spring Conf. for the Technology of Plasticity, the Japan Society for Technology of Plasticity, Tokyo, (1982), 173.