(1. 東北大學(xué) 材料與冶金學(xué)院, 沈陽 110004;
2. 撫順鋁廠, 撫順 113001)
摘 要: 向鑄鋁ADC12熔體中添加硫酸鋁銨， 由反應(yīng)分解的Al2O3原位生成了顆粒增強(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、 不團(tuán)聚的增強(qiáng)體顆粒； Al2O3顆粒增強(qiáng)鋁基復(fù)合材料中的片狀共晶硅的數(shù)量比未增強(qiáng)合金的少， 且Al2O3鄰近處的針狀共晶硅非常精細(xì)。 與基材相比， Al2O3顆粒增強(qiáng)鋁基復(fù)合材料的耐磨性較基材的提高了1~2倍， 硬度提高了15％， 且由硫酸鋁銨反應(yīng)自生成復(fù)合材料的耐磨性優(yōu)于添加氧化鋁形成的復(fù)合材料的。
關(guān)鍵字: 鋁基復(fù)合材料； 氧化鋁顆粒； NH4Al(SO4)2； 原位反應(yīng)
（ 1. School of Materials and Metallurgy, Northeastern University,
Shenyang 110004, China;
2. Fushun Aluminium Co., Ltd, Fushun 113001, China）
Abstract: A new method was developed to fabricate in situ Al2O3 particles reinforced Al-based MMCs by adding NH4Al(SO4)2 into molten ADC12 aluminum alloy. The SEM results show that the in situ Al2O3 particles are generally spherical and they are distributed uniformly in the ADC12 matrix. In composites, the amount of flaky eutectic Si is lower than that in unreinforced Al-matrix, and in the vicinity of Al2O3, fiber eutectic Si is very fine. The wear test results show that the abrasive properties of composites increase remarkably, which are 1-2 times as high as that of the base metal and the hardness increases 15%, and the abrasive property of the in-situ composites is better than that of the composites by adding Al2O3.
Key words: Al-based metal matrix composites; alumina particle; NH4Al(SO4)2; in situ reaction
