采用自蔓延高温合成技术制备(TiB2+Al2O3)增强NiAl基复合材料，并研究其相组成、显微组织和演化机制。结果表明：复合材料的组织及陶瓷相的形貌随添加(TiB2+Al2O3)含量的不同而变化，TiB2在短时间内以自组装的模式形成长条状、片状、鱼骨状以及规则的四方体和六棱柱等不同形态。TiB2的尺寸在2~5μm之间，与不规则的Al2O3伴生存在，少量TiB2分布于NiAl基体中。随着陶瓷相含量的增多，TiB2的形状趋于规则，且在NiAl基体中的分布更加均匀。
(TiB2+Al2O3)/NiAl composites were synthesized by self-propagation high-temperature synthesis, and their phase compositions, microstructures and evolution modes were studied. The microstructures and shapes vary with the TiB2+Al2O3 content in the NiAl matrix. TiB2 particles take a great variety of elementary shapes such as white bars, plates, herringbones, regular cubes and cuboids. These results outline a strategy of self-assembly processes in real time to build diversified microstructures. Some TiB2 grains in sizes of 2?5μm are embeded in Al2O3 clusters, while a small number of TiB2 particles disperse in the NiAl matrix. It is believed that the higher the TiB2+Al2O3 content is, the more the regular shapes and homogeneous distributions of TiB2 and Al2O3 will be present in the NiAl matrix.
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