Al-Pb-Cu合金的组织及摩擦性能
(华南理工大学 机械工程学院， 广州 510640)
摘 要: 用机械合金化制备了纳米复合Al-Pb-Cu合金粉末， 然后将之与钢背轧制复合，并进行烧结。 运用X射线衍射(XRD)、 扫描电镜(SEM)分析了轧制复合到钢背的Al-Pb-Cu合金的组织结构变化， 并测定了其摩擦磨损性能。结果表明： 烧结后的Al-Pb-Cu合金粉末已较好地与钢背结合在一起，并形成了过渡层； 在合金层中， 细小的Pb相保持均匀弥散的分布；在550 °C烧结保温1 h后， Pb的平均晶粒尺寸只有200 nm左右， 其摩擦磨损性能显著优于普通的Al-Pb-Cu合金。
关键字: 机械合金化； Al-Pb-Cu合金； 轧制复合；摩擦性能
（ College of Mechanical Engineering, South China University of Technology, Guangzhou 510640, China）
Abstract: Nanocomposite Al-Pb-Cu alloy powder was prepared by mechanical alloying (MA), and was cold rolled onto the steel matrix, then was sintered. The microstructure of the sintered Al-Pb-Cu alloy was characterized by X-ray diffraction and SEM and its wear properties were measured. The results show that the sintered Al-Pb-Cu alloy powder combines well with the steel matrix and a transition layer is formed. In the sintered Al-Pb-Cu alloy layer, tiny Pb phases are homogeneously distributed. For the alloy layer sintered for 1 h at 550°C, the average grain size of Pb is about 200 nm, which explains that the nanocomposite Al-Pb-Cu alloy exhibits much better wear properties than the common Al-Pb-Cu alloy.
Key words: mechanical alloying; Al-Pb-Cu alloys; cold rolling; wear properties
