间隙原子C在γ-TiAl基合金中的研究进展

Research progress of interstitial atom C in γ-TiAl based alloy

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。

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 inγ-TiAl based alloy was summarized.The solid solubility of carbon inγ-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 inγ-TiAl based alloy were analyzed.Some suggestions for the research on carbon addition inγ-TiAl based alloy were proposed.