中文摘要：

采用自蔓延高温合成技术制备（TiB_2＋Al_2O_3）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（TiB_2＋Al_2O_3）含量的不同而变化,TiB_2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。TiB_2的尺寸在2~5μm之间,与不规则的Al_2O_3伴生存在,少量TiB_2分布于NiAl基体中。随着陶瓷相含量的增多,TiB_2的形状趋于规则,且在NiAl基体中的分布更加均匀。

英文摘要：

（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.