Origin of the pre-peak in the structure factor of liquid Fe-4.30C-0.21Ce alloy

Xinying Teng Yifu Ye Huanrong Wang Zhiqiang Shi Guanghui Min and Haowei Wang1) State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200030, China2) College of Resource and Environment Engineering, East China University of Science and Technology, Shanghai 200237, China3) Key Lab. of Liquid Structure and Heredity of Materials, Ministry of Education, South Campus of Shandong University, Jinan 250061, China

摘 要：<正> The liquid structure of Fe-4.30C and Fe-4.30C-0.21Ce alloys was studied by high temperature X-ray diffractometer. The results show that for Fe-C alloy the nearest neighbor distance of the eutectic alloy is 0.259-0.260 nm at the temperature range of 1200-1400℃, which increases to 0.269-0.271 nm with the addition of 0.21% （mass fraction） Ce in the Fe-C alloy at the same temperature range. There is a pre-peak at Q = 15.5 nm-1 on the original intensity curve and structure factor S（Q） of the liquid Fe-4.30C-0.21Ce alloy, which was caused by the Ce atoms in the C-Ce clusters. Combined with the shared face, the tetragonal structure can meet the requirement for the distance of Ce-Ce atoms. It also shows that the cluster size in the liquid Fe-4.30C-0.21Ce alloy increases with the decreasing temperature.

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