(華南理工大學(xué) 材料科學(xué)與工程學(xué)院，廣州 510640)
摘 要: 利用機(jī)械合金化方法制備出Al-12%Sn-x%Si合金粉末，然后將其壓制成型，并進(jìn)行燒結(jié)得到塊體合金；運(yùn)用X線衍射儀(XRD)和掃描電鏡(SEM)等研究Si添加量對Al-12%Sn合金組織和性能的影響。結(jié)果表明：添加Si使得Al-12%Sn合金中Sn相變得更加細(xì)小且均勻分布，并且通過形成Al-Si共晶液相能夠有效改善合金的燒結(jié)活性，提高合金的致密度；隨著合金中Si添加量增加，合金的硬度、強(qiáng)度和塑性都有大幅度提升。此外，添加Si的Al-12%Sn合金的摩擦磨損性能也有較大提高，Si含量為2.5%時(shí)，合金具有最優(yōu)的摩擦性能。
關(guān)鍵字: Al-Sn-Si合金；機(jī)械合金化；摩擦性能
（School of Materials Science and Engineering，South China University of Technology, Guangzhou 510640, China）
Abstract:The mechanical alloying (MA) was used to prepare Al-12%Sn-x%Si alloy powders, and then, the bulk alloy was obtained by a combination of cold pressing and conventional powder sintering. The effects of Si addition on the microstructure and properties were investigated by XRD and SEM. The results show that appropriate Si addition can achieve the uniform Sn distribution in Al-12%Sn matrix. It can also effectively facilitate sintering due to the formation of Al-Si eutectic liquid phase, and significantly improve the densification of alloy. With the Si addition increasing, the hardness, strength and ductility enhance obviously. In addition, Si addition can also develop excellent wear properties in Al-12%Sn alloys, furthermore, when the Si addition is 2.5%, Al-12%Sn-2.5%Si has the best wear properties.
Key words: Al-Sn-Si alloy; mechanical alloying; wear properties
