Preparing method of TiAl inter-metallic compound containing rare earth element Er

Abstract

The invention discloses a preparing method of a TiAl inter-metallic compound containing the rare earth element Er. The method comprises the following steps: step 1, preparing a Ti-47Al-2Nb-2Cr-0.2Er alloy ingot of which the rear earth element Er content is 0.2at.%; step 2, processing the Ti-47Al-2Nb-2Cr-0.2Er alloy ingot into a round bar for directional solidification experiments; and step 3, preparing the round bar for the directional solidification experiments into a TiAl inter-metallic compound directional solidification sample containing the Er. The rare earth element Er is added into directional solidification TiAl-based alloy, oxygen atoms dissolved in the TiAl-based alloy are cleared by utilizing the rare earth element Er, the directional solidification structure is purified, and the lamellar structure of the directional solidification TiAl alloy is refined. At the same time, the directional solidification effect is not destroyed, and a great role is played on improving the room-temperature ductility of the TiAl alloy and realizing the engineering application of the TiAl alloy.

Description

technical field [0001] The invention relates to a method for synchronously purifying and refining the directional solidification TiAl-based alloy structure, in particular to a preparation method for a TiAl intermetallic compound containing rare earth element Er. Background technique [0002] In recent years, the research on TiAl-based alloys has been paid more and more attention by researchers of superalloys in various countries. TiAl-based alloys have high specific strength, high specific stiffness, and good high-temperature oxidation resistance, creep resistance and hydrogen embrittlement resistance, which are not found in general metals and alloys. They are considered to be the most likely to replace nickel and Lightweight alloys of superalloys. Obtaining TiAl-based alloy columnar grain structure by directional solidification method, and making TiAl-based alloy obtain a microscopic lamellar structure parallel to the growth direction or at an angle of 45° can improve the ...

AI Technical Summary

Problems solved by technology

Obtaining TiAl-based alloy columnar grain structure by directional solidification method, and making TiAl-based alloy obtain a microscopic lamellar structure parallel to the growth direction or at an angle of 45° can improve the performance of TiAl-based alloys, but due to raw materials and smelting process Because of the reason, a considerable amount of oxygen element will inevitably be introduced into the directionally solidified TiAl-based alloy matrix

These oxygen atoms dissolved in the alloy matrix will significantly reduce the room temperature plasticity of directionally solidified TiAl-based alloys

In addition, the coarse lamellar structure will also lead to the decrease of room temperature plasticity of directionally solidified TiAl-based alloys.

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