(1. 山东科技大学 材料科学与工程学院，青岛 266590；
2. Polytechnic Institute, Yugra State University, Rhanty-Mansiysk 628012, Russian Federation)
摘 要: 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2~5 μm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。
关键字: (TiB2+Al2O3)/NiAl复合材料；自蔓延高温合成；显微组织；演化机制
（1. School of Materials Science and Engineering,
Shandong University of Science and Technology, Qingdao 266590, China;
2. Polytechnic Institute, Yugra State University, Rhanty-Mansiysk 628012, Russian Federation）
Abstract:(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 2-5 μm 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.
Key words: (TiB2+Al2O3)/NiAl composites; self-propagation high-temperature synthesis; microstructure; evolution mechanism
