摘要
在富稀土辅合金中添加Co,Nb,Ti,Ga,Al等元素,用双合金工艺制备一系列不同辅合金含量的烧结Nd-Fe-B磁体,对力学性能进行系统研究。结果表明,在主合金(NdDyTb)12.69(FeCoNb)84.01B6.00的基础上添加3.0wt%的(NdDyTb)25(FeCoNbTiGaAl)68B7富稀土辅合金,其抗弯强度从316MPa提高到344MPa,抗弯强度的改善来自于边界结构的改善以及一些新相的生成。当辅合金含量达到8wt%,合金的强度又下降为321MPa。还研究了热处理工艺对Nd-Fe-B永磁材料力学性能的影响,含3.0wt%辅合金的磁体抗弯强度由烧结态的291MPa提高到最佳回火态的344MPa,又下降为非最佳回火态的304MPa。
Mechanical properties of sintered Nd-Fe-B magnets prepared by double alloy method and using the RE-rich sub-alloy with Co, Nb, Ti, Ga, and Al elements were investigated. The results show that bending strength increases from 316MPa for （NdDyTb）12.69 （FeCoNb）s4.01 B6.00 magnet to 344MPa for 3wt% （NdDyTb）25 （FeCoNbTiGaAl）68 BT-doped sample. The significant improvement of mechanical properties of the magnets originates from excellent boundary microstructure and some new phases formed by introducing alloying elements. The bending strength of the magnet with 8wt% sub-alloy decreases to 321MPa since mechanical properties of Nd-rich phase is poor. The results of the effect of heat treatment on the mechanical properties show that the bending strength of 3wt% （NdDyTb）25 （FeCoNbTiGaAl）68 BT-doped sample increases from 291MPa for sintered sample to 344MPa for optimally tempered sample, and reduces to 304MPa for over-tempered sample. Intergranular fracture mechanism of the magnets was discussed by observation of microstructure and fracture surface analysis.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2008年第6期31-35,共5页
Transactions of Materials and Heat Treatment
