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采用金相、扫描电镜、电子衍射、电子探针等技术,对原位法Cu—Nb合金的显微组织进行了研究。结果表明:铸态合金的显微结构,与合金的熔炼方式及采用的坩埚材料有关;熔炼过程引入的金属氧化物杂质,可诱发合金内出现难变形的球状体组织;具有典型树枝状结构的合金,有较高的纯度和较低的显微硬度,其加工性能良好;以此作成的纤维复合超导材料,承载电流的能力较高。
The microstructure of Cu-Nb alloy in-situ was investigated by metallographic, scanning electron microscopy, electron diffraction and electron probe techniques. The results show that the microstructure of the as-cast alloy is related to the melting method of the alloy and the material of the crucible used. The impurities of the metal oxide introduced during the melting process can induce the spheroidal structure to be deformed in the alloy. The microstructure with typical dendritic structure Alloy, with higher purity and lower microhardness, and its processing performance is good; made of fiber composite superconducting material, the ability to carry a higher current.