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Fabrication of a nanocomposite from in situ iron nanoparticle reinforced copper alloy

机译：由原位铁纳米颗粒增强铜合金制备纳米复合材料

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摘要

In situ iron nanoparticle reinforced Cu-3Sn-8Zn-6Pb alloy has been fabricated by centrifugal casting in a vacuum chamber with a medium frequency electrical furnace. The microstructure of this alloy was analyzed with a scanning electron microscope (SEM) and a high-resolution transmission electron microscope (HRTEM), and the results show that the grains of Cu-3Sn-8Zn-6Pb alloy without iron have a typical dendrite structure with dimensions from 500 to 1500 mu m, and the grains of the alloy with the addition of 1% iron are small and equiaxed, with dimensions from 20 to 60 mu m. Then, the relatively uniform dispersed particles in the copper matrix were identified with the HRTEM to be pure iron with dimensions in the order of 2-20 nm. The mechanical properties of the alloys were measured and the results show a significant increase in the tensile strength of the alloy with iron nanoparticles and a slight increase of the elongation compared to that without iron. The mechanism of formation of the iron nanoparticles was analyzed by thermodynamic and dynamic theories, and the results indicate that the in situ iron nanoparticles of Cu-3Sn-8Zn-6Pb alloy can reasonably form during solidification in the centrifugal casting technique.
机译：通过在带有中频电炉的真空室中离心铸造，就地制备了铁纳米粒子增强的Cu-3Sn-8Zn-6Pb合金。用扫描电子显微镜（SEM）和高分辨率透射电子显微镜（HRTEM）分析了该合金的显微组织，结果表明不含铁的Cu-3Sn-8Zn-6Pb合金晶粒具有典型的枝晶结构。合金的晶粒尺寸为500至1500微米，加入1％铁的合金晶粒很小且等轴，尺寸为20至60微米。然后，通过HRTEM将铜基质中相对均匀分散的颗粒鉴定为尺寸为2-20nm的纯铁。测量了合金的机械性能，结果表明，与不具有铁的情况相比，具有铁纳米颗粒的合金的拉伸强度显着提高，而伸长率则略有提高。通过热力学和动力学理论分析了铁纳米颗粒的形成机理，结果表明，在离心铸造工艺中，Cu-3Sn-8Zn-6Pb合金的原位铁纳米颗粒可以在凝固过程中合理地形成。

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