TiAl-based alloy with excellent high temperature oxidation resistance and creep resistance suitable for casting

Abstract

The invention discloses a TiAl-based alloy with excellent high temperature oxidation resistance and creep resistance suitable for casting and the alloy belongs to the gamma-TiAl alloy. The TiAl-based alloy comprises the following components by atomic percent: 44.0-48.0% of Al, 1.0-3.0% of Nb, 0.1-3.0% of Mo, 0-0.8% of Si or / and 0-0.6% of C, and the balance of Ti and impurity elements, wherein thesum of the atomic percents of Si and C is 0.1-0.9%. The TiAl-based alloy disclosed by the invention has good high temperature performances and casting fluidity and is suitable for the casting of thin-walled parts; methods such as chemical treatment, thermal spraying and ion implantation which are used to increase the oxidation resistance, are not required to treat the surface of the alloy at 850-950 DEG C; and the TiAl-based alloy is particularly suitable to cast the gasoline engine supercharger turbine rotor which can work below 900-950 DEG C.

Description

technical field [0001] The invention relates to a technology in the field of high-temperature alloys, in particular to a titanium-aluminum-based alloy that has excellent high-temperature oxidation resistance and creep resistance and is suitable for casting. Background technique [0002] With the continuous improvement of the performance of engines such as aviation, aerospace, automobiles, and ships, higher requirements are put forward for the performance of high-temperature materials, that is, higher strength, oxidation resistance, and lighter density. γ-TiAl-based alloy materials have the advantages of good high temperature strength, creep resistance and oxidation resistance, etc., and are developing into a new generation of aero-engine materials, which can be used to manufacture compressors, gas turbine blades, compressor stator windshields, stator machines Blocks and other large-scale casting and forging parts with complex shapes can partially replace bulky nickel-ba...

AI Technical Summary

Problems solved by technology

[0009] The high-temperature creep performance and high-temperature oxidation resistance of low-Nb (usually 1-3at%Nb) titanium-aluminum alloy materials are very poor, especially when the temperature is used for a long time at 850°C-950°C, the surface of the material is severely oxidized. Therefore, low Nb titanium-aluminum alloys are usually not suitable for the preparation of parts that are used for a long time in a high temperature environment of 850-950 °C

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