Multi-component high-alloying high-Nb-TiAl intermetallic compound

Abstract

The invention discloses a multi-component high-alloying high-Nb-TiAl intermetallic compound. The intermetallic compound comprises, by mole percentage, 40-50% of Al, 4-12% of Nb, 0-15% of (W, Ta, Mo and Co), 0-4.5% of (Ni, Fe, Hf and Zr), 0-4% of (V, Cr and Mn), 0-2% of B, 0-3% of (C and Si), 0-3% of rare earth element and the balance Ti and inevitable impurity. The number of alloy components is noless than 6 kinds. An obtained novel high-Nb-TiAl alloy material for casting and additional material manufacturing has excellent high-temperature strength, screep resisting performance and oxidationresisting performance, the casting and additional material manufacturing technology is good in performance, and the high-Nb-TiAl alloy can be adopted for producing precise castings and additional material manufactured components serving at 850 DEG C on a large scale, can also be used for preparing a heat deforming high-Nb-TiAl alloy component serving at a high temperature, and has popularization value.

Description

Technical field: [0001] The present invention relates to a multi-component high-alloyed high-Nb-TiAl intermetallic compound, in particular to a novel multi-component high-alloyed high-Nb-TiAl alloy material suitable for casting and additive manufacturing with a variety of trace elements It belongs to the technical field of superalloys. Background technique: [0002] TiAl intermetallic compound has low density, high specific strength and specific elastic modulus, and has good creep resistance and oxidation resistance. It is the most potential lightweight, high-strength and high-temperature structural material for the new generation of aviation and aerospace vehicles. At present, the service temperature of TiAl alloy is difficult to exceed 800°C, so it cannot be applied to components with higher working temperature and high temperature strength. Studies have shown that adding Nb alloy elements to TiAl alloys can further improve the high-temperature strength, creep resistance ...

AI Technical Summary

Problems solved by technology

[0006] The technical problems to be solved by the present invention are: firstly, most of the high Nb-TiAl alloy composition systems developed at present are suitable for deformation processes such as extrusion and forging, and cannot meet the requirements of complex components for casting and additive manufacturing of high Nb-TiAl alloys. performance and mechanical performance requirements; secondly, high Nb-TiAl alloy has poor plasticity and low thermal processing performance, and the material utilization rate is high and low cost, which limits its large-scale engineering application; moreover, the current laboratory stage casts high Nb-TiAl alloy strength, The plasticity is lower than that of the deformed alloy, and the casting forming method is difficult to break the coarse solidified structure by thermal deformation, and refine the grains to improve the mechanical properties. Therefore, multi-component high alloying is the most effective and easy to achieve to improve the mechanical properties of casting and additive manufacturing alloys. one of the methods