(1. 山東科技大學(xué) 材料科學(xué)與工程學(xué)院，青島 266590；
2. Polytechnic Institute, Yugra State University, Rhanty-Mansiysk 628012, Russian Federation)
摘 要: 采用自蔓延高溫合成技術(shù)制備(TiB2+Al2O3)增強(qiáng)NiAl基復(fù)合材料，并研究其相組成、顯微組織和演化機(jī)制。結(jié)果表明:復(fù)合材料的組織及陶瓷相的形貌隨添加(TiB2+Al2O3)含量的不同而變化，TiB2在短時(shí)間內(nèi)以自組裝的模式形成長(zhǎng)條狀、片狀、魚(yú)骨狀以及規(guī)則的四方體和六棱柱等不同形態(tài)。TiB2的尺寸在2~5 μm之間，與不規(guī)則的Al2O3伴生存在，少量TiB2分布于NiAl基體中。隨著陶瓷相含量的增多，TiB2的形狀趨于規(guī)則，且在NiAl基體中的分布更加均勻。
關(guān)鍵字: (TiB2+Al2O3)/NiAl復(fù)合材料；自蔓延高溫合成；顯微組織；演化機(jī)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
