(东北大学 材料与冶金学院, 沈阳 110004)
摘 要: 向铝熔体中添加脱水的硫酸铝铵， 于900 ℃下发生分解反应， 反应分解的Al2O3原位生成颗粒增强铝基复合材料。 SEM观察表明， Al2O3颗粒在铝基体中细小弥散分布，形成球形的、 不团聚的增强体颗粒。 与基材相比， Al/Al2O3复合材料的耐磨损性能明显提高，耐磨性是基材的4倍， 且由硫酸铝铵原位生成的复合材料耐磨性优于添加氧化铝形成的复合材料。 拉伸实验结果显示， 复合材料的抗拉强度没有明显变化，且塑性有所降低。
关键字: Al/Al2O3复合材料； Al2O3颗粒；耐磨性
by adding NH4Al(SO4)2 into pure Al melt
（ School of Materials and Metallurgy,
Northeastern University, Shenyang 110004, China）
Abstract: In situ particles strengthening aluminum based composites were formed through NH4Al(SO4)2 decomposition at 900 ℃ by adding NH4Al(SO4)2 to the molten aluminum. The TEM results show that the in-situ Al2O3 particles are generally spherical and uniformly distribute in the Al matrix. The wear tests results show that the abrasive properties of Al/Al2O3 composites increase remarkably and are 4 times as high as that of the base metal, and the abrasive properties of Al/Al2O3 composites fabricated by adding NH4Al(SO4)2 are better than that of Al/Al2O3 composites by adding Al2O3. The mechanical properties test results show that tensile strength doesn't change noticeably, while the ductility decreases.
Key words: Al/Al2O3 composites; Al2O3 particles; abrasive properties
