Understanding atomic-scale phase separation of liquid Fe-Cu alloy  

作　　者：WANG HaiPeng WEI BingBo 

机构地区：[1]Department of Applied Physics, Northwestern Polytechnical University, Xi＇an 710072, China

出　　处：《Chinese Science Bulletin》2011年第32期3416-3419,共4页

基　　金：supported by the National Natural Science Foundation of China (50971103 and 50971105);the Program for New Century Excellent Talents, Natural Science Foundation of Shaanxi Province (2010JQ6004);Shaanxi Project for Young New Star in Science and Technology;NPU Foundation for Fundamental Research

摘　　要：Using liquid Fe 60 Cu 40 alloy as a model, the structure of liquid Fe-Cu alloy systems is investigated in the temperature range 1200 2200 K, covering a large metastable undercooled regime, to understand the phase separation of liquid Fe-Cu alloys on the atomic scale. The total pair distribution functions (PDFs) indicate that liquid Fe 60 Cu 40 alloy is ordered in the short range and disordered in the long range. If the atom types are ignored, the total atom number densities and PDFs demonstrate that the atoms are distributed homogenously in the liquid alloy. However, the segregation of Fe and Cu atoms is very obvious with decreasing temperature. The partial PDFs and coordination numbers show that the Cu and Fe atoms are not apt to get together on the atomic scale at low temperatures; this will lead to large fluctuations and phase separation in liquid Fe-Cu alloy.Using liquid Fe6oCu4o alloy as a model, the structure of liquid Fe-Cu alloy systems is investigated in the temperature range 1200-2200 K, covering a large metastable undercooled regime, to understand the phase separation of liquid Fe-Cu alloys on the atomic scale. The total pair distribution functions （PDFs） indicate that liquid Fe60Cu40 alloy is ordered in the short range and dis- ordered in the long range. If the atom types are ignored, the total atom number densities and PDFs demonstrate that the atoms are distributed homogenously in the liquid alloy. However, the segregation of Fe and Cu atoms is very obvious with decreasing tem- perature. The partial PDFs and coordination numbers show that the Cu and Fe atoms are not apt to get together on the atomic scale at low temperatures; this will lead to large fluctuations and phase separation in liquid Fe-Cu alloy.

关 键 词：Fe-Cu合金 液态合金 原子尺度 相分离 PDF格式 数字显示 对分布函数 合金系统 

分 类 号：O562[理学—原子与分子物理]