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A ruthenium-containing multi-element tial alloy suitable for 800℃

A multi-component and alloy technology, applied in the field of ruthenium-containing multi-component TiAl alloys, can solve the problems of increasing the service temperature of multi-component TiAl alloys, which have not yet been seen, and achieve the effect of improving high-temperature performance and saving costs

Active Publication Date: 2021-12-14
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there has been no report on increasing the service temperature of multi-component TiAl alloys by adding trace Ru elements

Method used

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  • A ruthenium-containing multi-element tial alloy suitable for 800℃
  • A ruthenium-containing multi-element tial alloy suitable for 800℃
  • A ruthenium-containing multi-element tial alloy suitable for 800℃

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The composition of the present embodiment alloy is Ti-48Al-4Nb-2Cr-1.0Ru alloy, and specific implementation method is as follows: (1) sponge titanium, high-purity aluminum, aluminum-chromium master alloy, aluminum-niobium master alloy and high-purity ruthenium powder are formulated (2) Put the raw material weighed in step 1 into a vacuum non-consumable arc melting furnace; (3) After each smelting is completed, turn over and continue smelting, repeating 4 times to ensure the uniformity of the ingredients. The SEM photo of the as-cast structure of Ti-48Al-4Nb-2Cr-1.0Ru alloy is as follows figure 1 As shown, it is mainly composed of α 2 / γ lamellar clusters, with Ru-rich B2 phase and fine granular τ at the boundary and inside of the lamellar clusters 1 phase out. These tiny tau 1 Phase can be used as the second phase particle strengthened alloy.

Embodiment 2

[0027] The composition of the present embodiment alloy is Ti-48Al-4Nb-2Cr-0.3Ru alloy, and specific implementation method is as follows: (1) sponge titanium, high-purity aluminum, aluminum-chromium master alloy, aluminum-niobium master alloy and high-purity ruthenium powder are formulated (2) Put the raw material weighed in step 1 into a vacuum non-consumable arc melting furnace; (3) After each smelting is completed, turn over and continue smelting, repeating 4 times to ensure the uniformity of the ingredients. The SEM photo of the as-cast structure of Ti-48Al-4Nb-2Cr-0.3Ru alloy is as follows figure 2 As shown, it is mainly composed of α 2 / γ lamellar group structure, because the alloying elements are completely dissolved, no precipitated phase in Example 1 is seen at the boundary and inside of the lamella group.

Embodiment 3

[0029] The composition of the present embodiment alloy is Ti-47Al-4Nb-2Cr-0.5Ru alloy, and concrete implementation method is as follows: (1) sponge titanium, high-purity aluminum, aluminum-niobium master alloy and high-purity ruthenium powder are weighed by proportioning; ( 2) Put the raw materials weighed in step 1 into a vacuum non-consumable arc melting furnace; (3) After each smelting, turn over and continue smelting, repeating 4 times to ensure the uniformity of the ingredients. The SEM photo of the as-cast structure of Ti-47Al-4Nb-2Cr-0.5Ru alloy is as follows image 3 As shown, similar to Example 1, its organization is mainly composed of α 2 / γ lamellar group structure, Ru-rich phase precipitates at the boundary and inside of the lamella group, but its content is obviously lower than that of the alloy described in Example 1.

[0030] The service temperature of the Ti-48Al-4Nb-2Cr alloy without adding Ru element is below 750°C. Comparing it with the alloys prepared in t...

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Abstract

The invention discloses a ruthenium-containing multi-component TiAl alloy suitable for 800° C. The alloy is composed of Al, Nb, Cr, Ru and Ti elements, wherein the content of Al is 47-49 at. %, and the content of Nb is 4.0 at. %. %, Cr is 2.0at.%, Ru is 0.3-1.0at.%, and the rest is Ti. The alloy is obtained by ingot smelting. Unlike common alloying elements such as Ta, Nb and Cr, in addition to solid solution strengthening, Ru has a low solid solubility. Therefore, in the present invention, fine τ can be precipitated when a small amount of Ru is added. 1 phase particles, forming a second phase strengthening, and then increasing its service temperature to 800 °C.

Description

technical field [0001] The invention provides a ruthenium (Ru) multi-element TiAl alloy suitable for 800 DEG C, which belongs to the field of lightweight high-temperature structural materials. Background technique [0002] Due to the advantages of low density, high specific strength, low expansion coefficient, good high-temperature mechanics and oxidation resistance, TiAl alloy is considered to be a light-weight and high-temperature resistant structural material with great application prospects, and its service temperature exceeds the upper limit of the service temperature of titanium alloys. (600°C). At present, TiAl alloys have been successfully applied to key components such as aircraft engines, automobiles and tank turbochargers. GEnx TM The engine is in flight service. The Airbus A380 airliner equipped with forged TNM alloy engine blades successfully completed its first flight in 2014. In addition, TiAl alloy turbochargers are also successfully applied to the engine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/02C22B9/20
CPCC22C14/00C22C1/02C22B9/20
Inventor 杨劼人吴与伦胡锐焦自翔
Owner NORTHWESTERN POLYTECHNICAL UNIV