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采用真空非自耗电弧熔炼方法制备了Nb-16Si-xFe原位复合材料(x=2,4,6,原子分数(%),分别简称为2Fe、4Fe、6Fe合金),研究了Fe含量对Nb-16Si合金的显微组织与室温力学性能的影响。结果表明:铸态及热处理态(1350℃真空退火100h)2Fe和4Fe合金主要由Nb基固溶体(NbSS)、Nb3Si和Nb4FeSi三相组成,随着Fe含量的增多,Nb3Si含量减少,而Nb4FeSi含量增加,6Fe合金仅由NbSS和Nb4FeSi两相组成;热处理后NbSS上有细小的硅化物析出;Nb-16Si合金中加入Fe元素后所生成的新相Nb4FeSi是一个硬脆的硅化物相,其显微硬度和室温断裂韧性分别为HV 1110和1.22MPa.m1/2;随着Fe含量由2%提高到6%,热处理态Nb-16Si-xFe合金的室温断裂韧性呈略微下降趋势,而硬度和压缩强度呈上升趋势。
The Nb-16Si-xFe in-situ composites (x = 2, 4 and 6, atomic fraction%, respectively referred to as 2Fe, 4Fe and 6Fe alloys) were prepared by vacuum non-consumable arc melting method. Effect of Microstructure and Mechanical Properties on Nb-16Si Alloy at Room Temperature. The results show that the 2Fe and 4Fe alloys are mainly composed of Nb-based solid solution (NbSS), Nb3Si and Nb4FeSi in as-cast and heat-treated state (vacuum annealing at 1350 ℃ for 100h). With the increase of Fe content, the content of Nb3Si decreases and the content of Nb4FeSi increases , The 6Fe alloy consists of two phases, NbSS and Nb4FeSi only. After the heat treatment, fine silicide precipitates on the NbSS. The new phase Nb4FeSi formed after the addition of Fe in the Nb-16Si alloy is a hard and brittle silicide phase. Hardness and room temperature fracture toughness were HV 1110 and 1.22MPa.m1 / 2, respectively. With the increase of Fe content from 2% to 6%, the room temperature fracture toughness of heat-treated Nb-16Si-xFe alloy slightly decreased, while hardness and compression Intensity is on the rise.