从Al-ZrOCl2体系利用熔体直接反应法制备了原位ZrAl3和Al 2O3颗粒增强铝基复合材料。 Al-Zr-O体系中原位形成的ZrAl3具有四方结构， 其 最大 尺寸为4 μm， 纵横长度比小于2.0。 此外， 还有一定数量的亚微米级Al2O3 颗粒生成 ， 其晶体为六方结构， 纵横长度比大于2.0。 ZrAl3(p)， Al2O3(p)/Al复 合材 料凝固组织中， 随ZrOCl2加入量的增加， 生成的颗粒尺寸更小， 分布更均匀。 拉 伸试验 表明： Al-ZrOCl2体系制备的复合材料具有高的强度和塑性， 断口组织中存在大量韧窝 ， 韧窝中镶嵌着细小颗粒， 属韧性断裂。
In-situ ZrAl3 and Al2O3 particulates reinforced a luminum composites were fabricated by the direct melt reaction (DMR) meth od f rom Al-ZrOCl2 system. In-situ ZrAl3 particulates with a tetragonal struct ure， a length/width ratio lower than 2.0 and a maximum size of 4 μm we re forme d in the system Al-Zr-O. In addition， a certain number of submicron Al2O 3 particles with a hexagonal structure and a length/width ratio larger than 2.0 we re also generated in this system. In the microstructure of ZrAl3(p)+A l 2O3(p)/Al composite， in-situ formed particulates are finer and well -di stributed 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 fractu re. The fracture of (ZrAl3+Al2O3)p/Al composites belongs with toughness.
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