(1. 山東科技大學(xué) 材料科學(xué)與工程學(xué)院，青島 266590；
2. 機械科學(xué)研究總院 先進制造技術(shù)研究中心，北京 100083)
摘 要: 通過Ni、Al、TiO2和B2O3粉末之間的原位反應(yīng)合成(TiB2-Al2O3)/NiAl復(fù)合材料，研究材料的物相組成和組織結(jié)構(gòu)，并對典型組織的形成過程進行探討。結(jié)果表明：反應(yīng)產(chǎn)物由NiAl、TiB2和Al2O3這3種相組成。基體由NiAl和Al2O3組成，而TiB2顆粒規(guī)則，尺寸2~5 μm，呈簇狀鑲嵌在Al2O3中，少量彌散分布在NiAl基體上。分析認為TiB2的晶體結(jié)構(gòu)、含量、所處NiAl熔體環(huán)境以及極快的冷卻速度是影響其生長形態(tài)和分布的主要原因。
關(guān)鍵字: TiB2-Al2O3；NiAl；復(fù)合材料；原位合成；微觀組織
（1. School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;
2. Advanced Manufacture Technology Center, China Academy of Machinery Science and Technology,
Beijing 100083, China）
Abstract:(TiB2-Al2O3)/NiAl composite materials were synthesized by in-situ reaction from Ni, Al, TiO2 and B2O3 mixed powders. The phase composition, microstructure and formation mechanism of typical microstructure were studied. The results show that the products contain NiAl, TiB2 and Al2O3 phases; the matrix is made of NiAl and Al2O3 phases; and the regular TiB2 particles are in size range of 2−5 μm, which are embedded by Al2O3 in clusters. A small amount of TiB2 particles disperse in the NiAl matrix. It is believed that the crystal structure, content, surroundings of molten NiAl and the fast cooling speed are the main reasons for determining the morphology and distribution of TiB2 particles.
Key words: TiB2-Al2O3; NiAl; composite material; in-situ synthesis; microstructure
