高强铌合金具有比重小、强度高、韧性好、易焊接等优点，是制造高性能航空航天飞行器高温部件的重要材料，研究者通过碳化物强化、高温固溶淬火、大变形挤压、时效和热机械处理等方法研制出系列高强铌合金。航空航天高温结构件减重是研究新型铌合金的一个重要方向，选用密度为6～7．2 g／cm3的系列低密度铌合金，无涂层可在700℃以下工作，加涂层可在1200℃以下工作。铌硅复合材料有望成为在1350℃以上工作的航空发动机叶片材料，研究者通过前期研究筛选出多元Nb-Si-Ti-Al-Cr-X合金作为满足高温应用要求的新型铌合金的研究方向，揭示了铸态显微结构、热处理和热变形（热压、挤压、锻造）条件和机械性能，还研究了Al，Mo，B等合金元素对Nb-Si-Cr系合金抗氧化性能的影响。
High-strength niobium alloys providing low-density,high strength,very good ductility at room temperature, and good weldability,have been used for the high temperature parts of aero space aircraft which have high abilities.In or-der to improve the high-temperature strength and ductility at room temperature,the carbide strengthening,annealing and quenching at high temperature,high reduction of extrusion,aging,thermomechanical treatment have been used.In aero-space applications,weight savings have substantial benefit in system.A class of alloys with densities of 6. 2 ~8 g/cm3 can be used uncoated in air to ~700 ℃,and have sufficient oxidation resistance at 1 200 ℃ while coating failure is non-catastrophic.Niobium silicide-based in situ composites are hopeful for potential applications in turbine engines with service temperatures up to 1 350 ℃.After a preliminary investigation,the multi-component Nb-Si-Ti-Al-Cr-X system has been se-lected with the aim of developing new alloys that have the potential to meet the required properties for high temperature ap-plications.This paper reviews the microstructures of Nb-Si-Ti-Al-Cr-X alloy under as-cast,heated and hot deformed (high temperature compression,extrusion,forging)conditions and the mechanical properties.The effect of aluminum,molybde-num,and boron on the oxidation behavior of the Nb-Si-Cr alloy system has also been studied.
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