研究了微量硼和2 %Nb对铸造Ni50Al20Fe30合金组织及性能的影响。结果表明：微量硼的加入可以改善Ni50Al20Fe30合金的强度与塑性，最佳硼含量为0.02 %～0.05 %；此外，微量硼的加入影响该合金的共晶区,从而明显改变合金的微观组织形态。在硼含量为0.02 %时,该合金主要处于β相(NiAl)与γ相的共晶区,这对合金的室温塑性极为有利。添加2 %Nb可明显提高该合金的压缩屈服强度并改善塑性。在室温、650 ℃和1 000 ℃，该合金的压缩屈服强度分别提高30 %、59 %和36 %。
The effect of minor boron content and 2 %Nb on microstructure and mechanical properties of cast Ni50Al20Fe30 alloy has been investigated. The results show that minor B addition can improve the strength and the ductility of the Ni50Al20Fe30 alloy. The range of 0.02 %～0.05 % B is optimal for the alloy. The minor boron can influence the eutectic zone and microstructure of the alloy. The microstructure of alloy with 0.02 % B mainly consists of fine eutectic β (NiAl) and γ phases. This microstructure is favorable to ductility of the alloy at room temperature. The addition of 2 % Nb can evidently increase the yield strength and improve the ductility. The compressive yield strength of the alloy is increased about 30 %, 59 % and 36 % at room temperature, 650 ℃ and 1 000 ℃ respectively.
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