(1. 太原理工大学 机械工程学院，太原 030024；
2. 太原理工大学 材料科学与工程学院，太原 030024；
3. 哈尔滨工业大学 先进焊接与连接国家重点实验室，哈尔滨 150001)
摘 要: 铸造TiAl合金作为新型轻质高温结构材料其显微组织粗大，高温服役环境下强度和蠕变抗力不足成为限制其工业化应用的关键，而合金化则被认为是改善合金显微组织和力学性能的有效途径。综述间隙原子C在TiAl合金应用中的研究进展，重点介绍C在TiAl合金中的固溶极限及影响因素，简述TiAl合金中碳化物的结构、形态、分布及析出行为，并分析间隙原子C对合金显微组织及高温强度和蠕变抗力的影响及作用机理，对C在TiAl合金中的进一步研究应用提出建议。
关键字: TiAl基合金；间隙原子C；碳化物；显微组织；力学性能；强化机制
（1. College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China）
Abstract:As a highly promising material for high-temperature structural applications, the weakness of TiAl alloy, such as coarse microstructure, poor strength and creep resistance, under the service condition of elevated temperature becomes the key to limit its application. Alloying is treated as the effective solution for the improvement of microstructure and mechanical properties. The status quo of the research on interstitial carbon in γ-TiAl based alloy was summarized. The solid solubility of carbon in γ-TiAl based alloy and influence factors were stated emphatically. The structure, morphology, distribution and precipitation behavior of carbides were revealed detailly. Furthermore, the influence and mechanism of interstitial carbon on microstructure, strength and creep resistance at elevated temperature in γ-TiAl based alloy were analyzed. Some suggestions for the research on carbon addition in γ-TiAl based alloy were proposed.
Key words: TiAl based alloy; interstitial atom C; carbide; microstructure; mechanical property; strengthening mechanism
