1. 1) K. Nakade and T. Kuroda, “Precipitation mechanism of σ phase in super duplex stainless steels”, Journal of High Temperature Society, Vol.33, pp. 95-100 (2007).
2. 2) J.S. Kasper and R.M. Waterstrat, “Ordering of atoms in the σ phase”, Acta Crystallographica, Vol.9, pp. 289-295 (1956).
3. 3) GJ Dickins, Audrey M.B. Douglas and W.H. Taylor, "The crystal structure of the Co-Cr σ phase", Acta Crystallographica, Vol.9, pp. 297-303 (1956).
4. 4) K. Kumada, “About σ phase”, Bulletin of the Japan Institute of Metals, Vol.2, pp. 261-271 (1963).
5. 5) E. Obata, K. Itoh and T. Iikubo, “Precipitation behavior of σ phase in micro-duplex stainless steel”, Denki-Seiko (Electr. Furn. Steel), Vol.49, pp. 242-250 (1978).