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利用机械合金化制备纳米复合Al-Sn合金粉末,将其压制成型并烧结。运用X射线衍射仪、扫描电镜分析了纳米复合Al-Sn合金在烧结过程中的组织结构变化,测定了显微硬度。结果表明,随着烧结温度的升高,机械合金化制备的Al-Sn纳米复合结构长大。当烧结温度低于Al-Sn共晶温度时,Sn相分布均匀;当烧结温度超过Al-Sn共晶温度时,Sn相沿着粉末颗粒的周围呈网状分布,网状形态取决于球磨后的粉末颗粒尺寸。纳米复合Al-Sn合金的显微硬度随烧结温度的提高而降低,与传统的铸造方法相比,机械合金化方法显著强化了Al-Sn合金。
The nano-composite Al-Sn alloy powder is prepared by mechanical alloying, which is press-formed and sintered. The microstructures of nanocomposite Al-Sn alloy during sintering were analyzed by X-ray diffraction and scanning electron microscopy. The microhardness was measured. The results show that as the sintering temperature increases, the Al-Sn nanocomposite structure grown by mechanical alloying grows. When the sintering temperature is lower than the Al-Sn eutectic temperature, the Sn phase is evenly distributed. When the sintering temperature exceeds the Al-Sn eutectic temperature, the Sn phase recursively distributes along the periphery of the powder particles, and the reticular morphology depends on the ball- Powder particle size. The microhardness of the nano-composite Al-Sn alloy decreases with the increase of the sintering temperature. Compared with the traditional casting method, the mechanical alloying method significantly enhances the Al-Sn alloy.