Nb-Si金属间化合物基超高温合金研究进展  

A Review of Ultra High Temperature Nb-Si Based Superalloys

作　　者：贾丽娜[1] 翁俊飞[1] 沙江波[1] 周春根[1] 张虎[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100191

出　　处：《中国材料进展》2015年第5期372-378,382,共8页Materials China

基　　金：青年科学基金(51471013)

摘　　要：Nb-Si金属间化合物基超高温合金具有熔点高、密度低、高温强度和加工性能良好的优点,被认为是最有希望取代第3代Ni基单晶高温合金的候选材料。介绍了Nb-Si金属间化合物基超高温合金的典型组织特征、合金成分优化、组织控制以及组成相的作用等方面的研究进展。目前,室温韧性、高温强度和高温抗氧化性能等单项指标基本达到应用要求,但综合性能指标距航空发动机热端部件的应用要求还有较大差距。未来,在合金优化设计的基础上,如何寻求更合适的组织控制途径,实现室温韧性、高温强度和高温抗氧化性能硅化物的综合匹配,是Nb-Si金属间化合物基超高温合金发展的重要研究方向。With high melting point, low density, and good high-temperature strength and processability, ultra high temper- ature Nb-Si intermetallic based superalloys are considered as the most promising materials for replacing the third generation of monocrystal Ni-based superalloys. This paper introduced a series of results regarding typical microstructure characteris- tics, composition optimization, microstructural control, and roles of constituent phases for Nb-Si based superalloys. Re- cently, some properties, such as room-temperature fracture toughness, high-temperature strength, and oxidation resistance, have met the application requirements of turbine airfoil materials. However, there is still a gap between the current compre- hensive properties and application requirements. In the future, based on the optimization of alloy design, how to develop a more available process for microstructural control to achieve a comprehensive combination of room-temperature fracture tough- ness, high-temperature strength, and oxidation resistance, is important for the development of ultra high temperature Nb-Si intermetallic based superalloys.

关 键 词：Nb-Si金属间化合物基超高温合金 组织特征 综合性能 

分 类 号：TG132.32[一般工业技术—材料科学与工程]