摘要
利用CALPHAD技术优化计算了Nd-B二元系相图,计算结果有了进一步的改善。高温下液相没有出现溶解度隙,大多数零变量反应温度的计算值与评估值误差在1K以内,只有富B端的零变量反应LiquidNdB66+βNd的共晶温度的计算值2348K与评估值2323K相差25K。然后结合已有的Nd-Fe和Fe-B二元系相图与热力学数据,在Nd-Fe-B三元系的热力学实验数据和相平衡数据基础上,对Nd-Fe-B体系的三个稳定三元相Nd2Fe14B、NdFe4B4和Nd5Fe2B6进行优化计算。计算了该体系298K下的等温截面与x(Nd)∶x(B)=2∶1的垂直截面。最后分析了相图在Nd-Fe-B永磁材料合金成分设计以及合金配比方式选择中的指导作用。
Nd-B binary system has been assessed thermodynamically by means of CALPHAD（Calculation of Phase Diagram） method,and the calculation results were further improved.There no miscibility gap exists in liquid phase at high temperature,the errors within 1K between assessment data and most of calculated temperature of invariant reactions,except for the calculated eutectic temperature（2348K） of invariant reaction Liquid？NdB66＋βNd at rich-B corner,which shows a discrepancy of 25K between the evaluation value（2323K）.Additionally,based on the diagram and thermodynamic data of Nd-Fe and Fe-B binary systems and the experimental thermodynamic and equilibria data of Nd-Fe-B,we have calculated the three stable phase（Nd2Fe14B,NdFe4B4,Nd5Fe2B6） and the isothermal sections at 298K and isopleths section at x（Nd）∶x（B）=2∶1.Finally,we analyzed the guiding role of diagram in the composition design and alloy components selection mode on Nd-Fe-B alloy material.
出处
《磁性材料及器件》
CSCD
北大核心
2010年第6期14-16,28,共4页
Journal of Magnetic Materials and Devices
基金
国家自然科学基金资助项目(50874050)
广东省自然科学基金资助项目(8151064101000084)
广东省科技计划资助项目(2008B010600005)
关键词
ND-FE-B
相图计算
合金成分设计
Nd-Fe-B
calculation of phase diagram
alloy composition design
