Al-Pb-Cu合金的組織及摩擦性能
(華南理工大學(xué) 機(jī)械工程學(xué)院， 廣州 510640)
摘 要: 用機(jī)械合金化制備了納米復(fù)合Al-Pb-Cu合金粉末， 然后將之與鋼背軋制復(fù)合，并進(jìn)行燒結(jié)。 運(yùn)用X射線衍射(XRD)、 掃描電鏡(SEM)分析了軋制復(fù)合到鋼背的Al-Pb-Cu合金的組織結(jié)構(gòu)變化， 并測(cè)定了其摩擦磨損性能。結(jié)果表明： 燒結(jié)后的Al-Pb-Cu合金粉末已較好地與鋼背結(jié)合在一起，并形成了過(guò)渡層； 在合金層中， 細(xì)小的Pb相保持均勻彌散的分布；在550 °C燒結(jié)保溫1 h后， Pb的平均晶粒尺寸只有200 nm左右， 其摩擦磨損性能顯著優(yōu)于普通的Al-Pb-Cu合金。
關(guān)鍵字: 機(jī)械合金化； Al-Pb-Cu合金； 軋制復(fù)合；摩擦性能
WANG Hui, LI Yuan-yuan, ZHU Min
（ 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
