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低温区间的Fe-N二元相图理论分析

雷明凯; 王兴军   

  1. 大连理工大学材料工程系表面工程研究室 大连 116024
  • 收稿日期:2002-06-05 修回日期:2002-07-15 出版日期:2003-07-20 网络出版日期:2003-07-20

Theoretical Analysis of Binary Fe-N Phase Diagrams at Low Temperatures

LEI Ming-Kai; WANG Xing-Jun   

  1. Surface Engineering Laboratory; Department of Materials Engineering; Dalian University of Technology; Dalian 116024; China
  • Received:2002-06-05 Revised:2002-07-15 Published:2003-07-20 Online:2003-07-20

摘要: 采用亚点阵的化合物能模型计算低温区间Fe-N二元相图。计算结果表明,25~350℃低温区,分别存在着α-Fe(N)和γ'-Fe4N,γ'-Fe4N和ε-Fe2N1-x二相平衡。α-Fe(N),γ'-Fe4N,ε-Fe2N1-x均为热力学稳定相。依据Guillermet和Du的热力学性质参数计算的低温区间Fe-N二元相图与现有实验数据相符。

关键词: Fe-N二元相图, 热力学, 模型

Abstract: he binary Fe-N phase diagrams at the low temperatures were calculated by using a two-sublattice version of the Compound Energy Model (CEM). The phase
equilibrium of α-Fe(N) and γ’-Fe4N, and γ-Fe4N and ε-Fe2N1-x was respectively obtained in the temperature range of 25~350 ℃. The α-Fe(N), γ’-Fe4N, and
ε-Fe2N1-x phases are thermodynamically stable at the low temperatures. The calculated binary Fe-N phase diagram by using the Guillermet
and Du’s parameters describing the thermodynamic properties of Fe-N phases was confirmed from the available experimental data at the low temperatures.

Key words: binary Fe-N phase diagram, thermodynamics, model

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