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采用真空电弧熔炼制备了Ni-28.5Al-43V成分的合金。对于真空电弧熔炼纽扣锭不同位置处微观组织及力学性能进行了研究。利用光学显微镜(OM),X射线衍射(XRD),扫描电镜(SEM),分析了合金不同凝固位置处的相组成和组织形态。结果表明,合金的凝固组织主要是由V相枝晶组织与NiAl+V片层共晶组成。同时对初生相及共晶相进行显微硬度测定。初生V相硬度(HV)在398~425之间,约为纯V硬度的3倍,表明V的固溶强化效果较为明显。另外,高温压缩强度与室温断裂韧度较NiAl合金均有很大提高,表明V的加入可提高NiAl合金的室温塑性与高温强度。
Ni-28.5Al-43V alloy was prepared by vacuum arc melting. The microstructure and mechanical properties of the vacuum arc melting at different positions were studied. The phase composition and microstructure of the alloy at different solidification positions were analyzed by OM, XRD and SEM. The results show that the solidified microstructure of the alloy consists mainly of V-phase dendrite and NiAl + V sheet. At the same time, the micro-hardness of the primary phase and the eutectic phase were measured. The virgin V phase hardness (HV) is between 398 and 425, which is about 3 times of the pure V hardness, indicating that the solid solution strengthening effect of V is obvious. In addition, the high temperature compressive strength and room temperature fracture toughness than the NiAl alloy have greatly improved, indicating that the addition of V can improve the room temperature plasticity and high temperature strength of NiAl alloy.