(1. 华南理工大学 材料科学与工程学院，广州 510640；
2. 华南理工大学 机械与汽车工程学院，广州 510640；
3. 广东省先进储能材料重点实验室，广州 510640)
摘 要: 利用机械合金化方法制备出Al-12%Sn-x%MgH2(质量分数)合金粉末，然后将其压制成型并进行烧结，得到合金块体；并运用X射线衍射仪、扫描电镜、拉伸机和摩擦磨损实验机研究添加MgH2对Al-12%Sn合金组织结构和性能的影响。结果表明：添加MgH2能使合金中的Sn更加细小均匀分布在Al基体上，同时能破坏Al颗粒表面的氧化膜，增加Al-12%Sn合金的烧结活性。随着MgH2含量的增加，合金的致密度和拉伸强度显著提高。但当MgH2过量时，会生成硬脆相Mg2Sn，造成基体Sn相的缺失，并降低合金的力学性能。此外，添加适量的MgH2对Al-12%Sn合金的耐磨性也有明显改善。当MgH2添加量为0.8%时，合金具有最优的综合力学性能和摩擦磨损性能。
关键字: 机械合金化；Al-Sn系合金；MgH2；力学性能；摩擦学性能
（1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;
2. School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640, China;
3. Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, Guangzhou 510640, China）
Abstract:The mechanical alloying(MA) was used to prepare Al-12%Sn-x%MgH2 (mass fraction) alloy powder. Then the bulk alloy was obtained by a combination of cold pressing and conventional powder sintering. The effects of MgH2 addition on the microstructure and properties of Al-12%Sn were investigated by XRD, SEM, mechanical properties tester and wearing tester. The results show that MgH2 addition can achieve Sn phase homogenously distribution in Al matrix. It also can disrupt the oxide film covered on Al particles and increase the sintering activity of Al-12%Sn alloy. With the MgH2 addition increasing, the relative density and tensile strength of Al-12%Sn alloy improve significantly. But excessive MgH2 addition will bring about brittle phase Mg2Sn, which not only causes the poor of Sn phase in the matrix but also leads to the deterioration of the alloys. In addition, MgH2 addition can also improve the wear properties of Al-12%Sn alloy. When the MgH2 content is 0.8%, Al-12%Sn alloy exhibits the best mechanical properties and wear properties .
Key words: mechanical alloying; Al-Sn based alloy; MgH2; mechanical properties; wear property
