与钢背轧制复合的纳米复合Al-Pb-Cu合金的组织及摩擦性能

Microstructure and wear properties of nanocomposite Al-Pb-Cu alloy cold-rolled onto steel matrix

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℃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。

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℃, 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.