(1. 太原理工大學 機械工程學院，太原 030024；
2. 太原理工大學 材料科學與工程學院，太原 030024；
3. 哈爾濱工業(yè)大學 先進焊接與連接國家重點實驗室，哈爾濱 150001)
摘 要: 鑄造TiAl合金作為新型輕質(zhì)高溫結構材料其顯微組織粗大，高溫服役環(huán)境下強度和蠕變抗力不足成為限制其工業(yè)化應用的關鍵，而合金化則被認為是改善合金顯微組織和力學性能的有效途徑。綜述間隙原子C在TiAl合金應用中的研究進展，重點介紹C在TiAl合金中的固溶極限及影響因素，簡述TiAl合金中碳化物的結構、形態(tài)、分布及析出行為，并分析間隙原子C對合金顯微組織及高溫強度和蠕變抗力的影響及作用機理，對C在TiAl合金中的進一步研究應用提出建議。
關鍵字: TiAl基合金；間隙原子C；碳化物；顯微組織；力學性能；強化機制
（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
