Ti2AlNb particle plasticized TiAl-based composite material and preparation method thereof

Abstract

The invention belongs to the technical field of new material design and additive manufacturing. The invention provides a Ti2AlNb particle plasticized TiAl-based composite material and a preparation method thereof. The composite material is composed of, by volume, 1.0%-10.0% of Ti2AlNb and 90.0%-99.0% of TiAl alloy, wherein the TiAl alloy is composed of, by atomic percent, 45%-48.5% of Ti, 45%-48.5% of Al and 3%-5% of other alloy elements, the alloy elements are the combination of 2-4 elements of Cr, Nb, V, Mn, Mo and C, and the atomic percent of C in the TiAl alloy is smaller than or equal to 0.15%. The preparation method comprises the following steps of carrying out high-temperature heating treatment on a substrate before forming; and preparing by adopting a synchronous high-temperature heating and electromagnetic stirring assisted laser direct deposition method; According to the TiAl-based composite material and the preparation method, grain refinement of the material is achieved, the room-temperature plasticity is greatly improved, and the TiAl-based composite material and the preparation method have important significance in promoting development and application of the TiAl-based material in engine parts.

Description

technical field [0001] The invention belongs to the technical field of new material design and additive manufacturing. involving a Ti 2 TiAl-based composite material plasticized with AlNb particles and its preparation process. Background technique [0002] TiAl-based alloy is a new type of lightweight high-temperature structural material. It not only has low density, but also has excellent high-temperature performance. It can work stably and reliably at high temperatures of 760°C to 850°C. Therefore, TiAl alloys will replace some nickel-based superalloys in the new generation of aerospace engines, and are used in the manufacture of hot end components such as combustor swirlers, casings, high-pressure compressor blades and low-pressure turbine blades. However, TiAl-based alloys are mainly composed of the γ-TiAl phase matrix and the second phase α 2 -Ti 3 Al phase composition, these two phases are intermetallic compounds, the strong bonding force between Ti-Al endows TiAl-...

AI Technical Summary

Problems solved by technology

At present, adding Cr, V, Mo and other alloys to TiAl-based alloys can significantly improve hot workability, superplasticity and high temperature oxidation resistance, but it still cannot fundamentally solve the shortcomings of low room temperature plasticity.

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