ti 2 Tial-based composite material plasticized by alnb particles and preparation method thereof

Abstract

The invention belongs to the technical field of new material design and additive manufacturing. provides a Ti 2 A TiAl-based composite material plasticized with AlNb particles and a preparation method thereof. The composite material is composed of 1.0% to 10.0% Ti by volume percentage 2 AlNb and 90.0% to 99.0% TiAl alloy, TiAl alloy is composed of 45% to 48.5% Ti, 45% to 48.5% Al and 3% to 5% other alloying elements by atomic percentage, and the alloying elements are Cr, Nb, V A combination of 2 to 4 elements in , Mn, Mo and C, wherein the atomic percentage of C in the TiAl alloy is ≤0.15%. In the preparation method, the substrate is subjected to high-temperature heat treatment before forming; then, the method of synchronous high-temperature heating and electromagnetic stirring assisted laser direct deposition is used for preparation; the TiAl-based composite material and preparation method of the present invention realize grain refinement of the material, The plasticity at room temperature has been greatly improved, which is of great significance to promote the development and application of TiAl-based materials in engine parts.

Description

technical field [0001] The invention belongs to the technical field of new material design and additive manufacturing. involves a Ti 2 AlNb particle plasticized TiAl matrix composite material and preparation process. Background technique [0002] TiAl-based alloy is a new type of lightweight high-temperature structural material, which not only has low density, but also has excellent high-temperature performance, and 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 for 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 a γ-TiAl phase matrix and a second phase α 2 -Ti 3 The Al phase composition, both of which are intermetallic compounds, the strong bonding force between Ti-Al endows the TiAl-based alloy with g...

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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