Ti3AlC2/TiAl基复合材料的制备、微结构调控与性能研究

项目名称： Ti3AlC2/TiAl基复合材料的制备、微结构调控与性能研究

项目编号： No.51201094

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 金属材料学科

项目作者： 艾桃桃

作者单位： 陕西理工学院

项目金额： 25万元

中文摘要： TiAl金属间化合物是一种在航空航天发动机、能源及汽车工业领域中极具应用潜力的轻质高温结构材料，但是本征脆性以及高温氧化抗力不足等瓶颈问题亟需解决。柔性Ti3AlC2三元层状化合物兼具金属-陶瓷的双重特性，是TiAl金属间化合物最为理想的增强相之一。本项目通过研究Ti3AlC2/TiAl基复合材料制备过程中增强相分散、界面结合等制约复合效应发挥的关键科学问题，建立复合界面设计准则，揭示增强相与基体之间的作用以及复合界面形成机制，实现复合界面及结构的有效调控；系统研究工艺-结构-性能之间的关系，探讨强韧化机理，揭示微结构与力学行为的耦合规律；通过高温氧化实验，分析高温氧化行为以及主要的影响因素，建立高温氧化动力学模型，揭示高温氧化机制。本项目研究有望使TiAl基复合材料"更轻、更刚、更强和更耐热"，从而更好地满足国家经济和社会发展对轻质高温材料的需求。

中文关键词： TiAl基复合材料；三元层状碳化物；微结构；强韧化机理；氧化行为

英文摘要： As the new light-weight high-temperature structural material, TiAl intermetallic compounds have great potential application in aerospace engine, energy and automotive fields. But the bottleneck problems including poor room temperature ductility and high-temperature oxidation resistance limit their application. Layered ternary carbide Ti3AlC2 which combines many of the merits of both metals and ceramics, is the best reinforcement for TiAl intermetallic compound. In this project, the key scientific problems of reinforcement dispersion and interface combination which restrict the realizing of composite effect during the preparation process of Ti3AlC2/TiAl matrix composites are investigated. The design criterion of composite interface is established. The interacting between Ti3AlC2 reinforcement and matrix, and the formation mechanism of composite interface are revealed, so as to realize the effective control of composite interface and structure. By studying on the relationship of the processes, microstructure and properties of the composites, the coupling rule of composite structure and mechanical behavior are demonstrated, and the strengthening-toughening mechanism is discussed. By the high-temperature oxidation experiments, the high-temperature oxidation rule and the main influencing factors are analyzed, the hig

英文关键词： TiAl matrix composites；layered ternary carbide；microstructure；strengthening-toughening mechanism；oxidation behavior