Liquid structure of pure iron by X-ray diffraction

Jun Luo, Qijie Zhai, Pei Zhao, and Xubo Qin Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China Central Iron & Steel Research Institute, Beijing 100081, China The Key Laboratory of State Education Ministry for Liquid Structure and Heredity of Materials, Shandong University, Jinan 250061, China

摘 要：<正> The liquid structure of pure iron at 1540, 1560 and 1580℃ was studied by X-ray diffraction. The results show that near the melting point there is a medium-range order structure that fades away with the increasing temperature. The average nearest distance of atoms is almost independent of the melts temperature, but the average coordination number, the atom cluster size and the atom number in an atom cluster all decrease with the increasing temperature of the melt. Near the melting point there are a lot of atom clusters in the pure iron melt. The atom cluster of pure iron has the body-centered cubic lattices, which are kept from the solid state. And the body-centered cubic lattices connect into network by occupying a same edge. The atoms in the surrounding of the atom clusters are arranged disorderly.

关键词：