(東北大學(xué) 材料與冶金學(xué)院, 沈陽(yáng) 110004)
摘 要: 向鋁熔體中添加脫水的硫酸鋁銨， 于900 ℃下發(fā)生分解反應(yīng)， 反應(yīng)分解的Al2O3原位生成顆粒增強(qiáng)鋁基復(fù)合材料。 SEM觀察表明， Al2O3顆粒在鋁基體中細(xì)小彌散分布，形成球形的、 不團(tuán)聚的增強(qiáng)體顆粒。 與基材相比， Al/Al2O3復(fù)合材料的耐磨損性能明顯提高，耐磨性是基材的4倍， 且由硫酸鋁銨原位生成的復(fù)合材料耐磨性優(yōu)于添加氧化鋁形成的復(fù)合材料。 拉伸實(shí)驗(yàn)結(jié)果顯示， 復(fù)合材料的抗拉強(qiáng)度沒(méi)有明顯變化，且塑性有所降低。
關(guān)鍵字: Al/Al2O3復(fù)合材料； Al2O3顆粒；耐磨性
by adding NH4Al(SO4)2 into pure Al melt
SHI Yu-juan, LIU Chang-sheng
（ 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
