(1. 東南大學(xué) 機(jī)械工程系， 南京 210096；
2. 江蘇理工大學(xué) 材料科學(xué)與工程學(xué)院， 鎮(zhèn)江 212013)
摘 要: 從Al-ZrOCl2體系利用熔體直接反應(yīng)法制備了原位ZrAl3和Al2O3顆粒增強(qiáng)鋁基復(fù)合材料。Al-Zr-O體系中原位形成的ZrAl3具有四方結(jié)構(gòu)，其最大尺寸為4 μm，縱橫長(zhǎng)度比小于2.0。此外，還有一定數(shù)量的亞微米級(jí)Al2O3顆粒生成，其晶體為六方結(jié)構(gòu)，縱橫長(zhǎng)度比大于2.0。ZrAl3(p)，Al2O3(p)/Al復(fù)合材料凝固組織中，隨ZrOCl2加入量的增加，生成的顆粒尺寸更小，分布更均勻。拉伸試驗(yàn)表明：Al-ZrOCl2體系制備的復(fù)合材料具有高的強(qiáng)度和塑性，斷口組織中存在大量韌窩，韌窩中鑲嵌著細(xì)小顆粒，屬韌性斷裂。
關(guān)鍵字: 鋁基復(fù)合材料； ZrOCl2； ZrAl3； Al2O3
reaction in system Al-ZrOCl2
（1. Department of Mechanical Engineering，
Southeast University， Nanjing 210096, P.R.China;
2. School of Materials Science and Engineering，Jiangsu University of Science and Technology，Zhenjiang 212013, P.R.China）
Abstract:In-situ ZrAl3 and Al2O3 particulates reinforced aluminum composites were fabricated by the direct melt reaction (DMR) method from Al-ZrOCl2 system. In-situ ZrAl3 particulates with a tetragonal structure， a length/width ratio lower than 2.0 and a maximum size of 4 μm were formed in the system Al-Zr-O. In addition， a certain number of submicron Al2O3 particles with a hexagonal structure and a length/width ratio larger than 2.0 were also generated in this system. In the microstructure of ZrAl3(p)+Al2O3(p)/Al composite， in-situ formed particulates are finer and welldistributed with the increasing of ZrOCl2 addition. Tensile tests indicate that composites fabricated by the system Al-ZrOCl2 exhibite high strength and ductility. There are a lot of ripples with fine particulates on the fracture. The fracture of (ZrAl3+Al2O3)p/Al composites belongs with toughness.
Key words: Al matrix composite； ZrOCl2； ZrAl3； Al2O3
