采用SEM, XRD和TMS系统地研究了电弧熔炼Fe100-xNbx(x=6, 9,12, 15, 17)合金的显微组织和压缩性能. 结果表明, 合金主要由初生相(α-Fe或Fe2Nb)和共晶组织(L→α-Fe+Fe2Nb)组成;Fe91Nb9合金具有最佳的综合力学性能, 其压缩断裂强度可达1.63 GPa,屈服强度可达1.04 GPa, 压缩应变延伸率可达23%. 用Hf部分代替Fe91Nb9合金中的Nb, 对合金的显微组织和压缩力学性能不产生明显影响; 用Y部分代替Fe91Nb9合金中的Fe会使合金的力学性能急剧恶化.
The microstructures and compressive properties of arc–melted Fe100−xNbx(x=6, 9,12, 15, 17) alloys, which are relevant to eutectic reaction (L → α–Fe+Fe2Nb), were investigated by SEM, XRD and test machine system 810 (TMS 810). The results showed that the microstructure of the ingot sample consisted of primary phase (α–Fe or Fe2Nb) and sub–micro–sized eutectics. Fe91Nb9 alloy had the best comprehensive properties with ultimate strength about 1.63 GPa, yield strength about 1.04 GPa and compressive strain ductility about 23%. For alloy Fe91Nb9, the substitution of Hf element for Nb element produced no observable effects on both the microstructure and the compressive mechanical properties; while the substitution of Y element for Fe element resulted in obvious change in the microstructure and dramatic deterioration in the mechanical properties.
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