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Ruthenium-containing multi-component TiAl alloy suitable for temperature of 800 DEG C

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

Active Publication Date: 2020-12-11
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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  • Ruthenium-containing multi-component TiAl alloy suitable for temperature of 800 DEG C
  • Ruthenium-containing multi-component TiAl alloy suitable for temperature of 800 DEG C
  • Ruthenium-containing multi-component TiAl alloy suitable for temperature of 800 DEG C

Examples

Experimental program
Comparison scheme
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 according to (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 present embodiment alloy is Ti-47Al-4Nb-2Cr-0.5Ru alloy, and specific 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 the a...

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Abstract

The invention discloses a ruthenium-containing multi-component TiAl alloy suitable for the temperature of 800 DEG C. The alloy is composed of 47-49 at.% of Al, 4.0 at.% of Nb, 2.0 at.% of Cr, 0.3-1.0at.% of Ru and the balance of Ti, and the alloy is obtained through an ingot casting smelting mode. Different from common alloying elements such as Ta, Nb and Cr, besides solid solution strengthening,the solid solubility of the Ru element is low. Therefore, under the condition that a trace amount of Ru is added, fine tau1-phase particles can be separated out, second-phase strengthening is formed,and then the service temperature is increased to 800 DEG 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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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
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