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Carbon-silicon-tungsten-yttrium lamellar structure high-niobium titanium-aluminum alloy and preparation method thereof

A titanium-aluminum alloy and microstructure technology, which is applied in the field of lamellar-structured high-niobium-titanium-aluminum alloys with carbon-silicon-tungsten-yttrium addition and its preparation, can solve the problems of insufficient oxidation resistance, poor plasticity, and limited wide application, and achieve good resistance to Oxidation and creep resistance, increased strength, precise parameter control effect

Inactive Publication Date: 2013-05-01
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the shortcomings of the alloy, such as room temperature brittleness, poor plasticity, and insufficient oxidation resistance at high temperatures, its wide application in practice is limited.

Method used

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  • Carbon-silicon-tungsten-yttrium lamellar structure high-niobium titanium-aluminum alloy and preparation method thereof
  • Carbon-silicon-tungsten-yttrium lamellar structure high-niobium titanium-aluminum alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Using pure titanium, pure aluminum, pure niobium, pure carbon, pure silicon, pure tungsten, and pure yttrium (all with a purity of 99.99%) as raw materials, according to Ti 45 Al 45 Nb 5 C 0.5 Si 0.1 W 1 Y 0.1 The composition ratio of the material is weighed.

[0025] (2) Put the above-mentioned prepared raw materials into an electric arc melting furnace, evacuate to 0.01Pa, fill with high-purity argon to 600Pa, and then melt under the conditions of an electric arc melting furnace current of 200A and a voltage of 2V to prepare The composition is Ti 45 Al 45 Nb 8 C 0.5 Si 0.1 W 1 Y 0.1 button ingots, weighing 20g.

[0026] (3) Put the button ingot prepared above into the suspension smelting furnace, evacuate to 5Pa, fill it with high-purity argon to 0.03MPa, and then use a quartz tube with a diameter of Ф4mm under the condition of the suspension smelting furnace power of 20KW Suction casting, the prepared composition is Ti 45 Al 45 Nb 8 C 0.6 Si 0....

Embodiment 2

[0030] (1) Using pure titanium, pure aluminum, pure niobium, pure carbon, pure silicon, pure tungsten, and pure yttrium (all with a purity of 99.99%) as raw materials, according to Ti 44 Al 46 Nb 7 C 0.8 Si 0.3 W 1.6 Y 0.3 The composition ratio of the material is weighed.

[0031] (2) Put the above-mentioned prepared raw materials into an electric arc melting furnace, evacuate to 0.02Pa, fill with high-purity argon to 630Pa, and then smelt under the conditions of an electric arc melting furnace current of 200A and a voltage of 2V to prepare The composition is Ti 44 Al 46 Nb 7 C 0.8 Si 0.3 W 1.6 Y 0.3 button ingots, weighing 25g.

[0032] (3) Put the button ingot prepared above into the suspension smelting furnace, evacuate to 7Pa, fill it with high-purity argon to 0.04MPa, and then use a quartz tube with a diameter of Ф4mm under the condition of the power of the suspension smelting furnace to be 20KW Suction casting, the prepared composition is Ti 44 Al 45 Nb ...

Embodiment 3

[0036] (1) Using pure titanium, pure aluminum, pure niobium, pure carbon, pure silicon, pure tungsten, and pure yttrium (all with a purity of 99.99%) as raw materials, according to Ti 43 Al 48 Nb 8 C 1 Si 0.5 W 2 Y 0.5 The composition ratio of the material is weighed.

[0037] (2) Put the above-mentioned prepared raw materials into an electric arc melting furnace, evacuate to 0.03Pa, fill with high-purity argon to 650Pa, and then smelt under the conditions of an electric arc melting furnace current of 200A and a voltage of 2V to prepare The composition is Ti 43 Al 48 Nb 8 C 1 Si 0.5 W 2 Y 0.5 button ingots, weighing 30g.

[0038] (3) Put the button ingot prepared above into the suspension smelting furnace, evacuate to 10Pa, fill with high-purity argon to 0.05MPa, and then use a quartz tube with a diameter of Ф4mm under the condition of the power of the suspension smelting furnace at 20KW Suction casting, the prepared composition is Ti 43 Al 48 Nb 8 C 1 Si 0....

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Abstract

The invention relates to a carbon-silicon-tungsten-yttrium lamellar structure high-niobium titanium-aluminum alloy and a preparation method thereof. The alloy belongs to a gamma-TiAl alloy and comprises 45.0-48.0% of Al, 5.0-8.0% of Nb, 0.5-1% of C, 0.1-0.5% of Si, 1.0-2.0% of W, 0.1-0.5% of Y, and the balance of Ti. The preparation method comprises the steps of preparing a button ingot through electric arc melting, casting a cylindrical test bar through suspension smelting, conducting directional solidification on the test bar by an optical float-zone method, and obtaining a lamellar structure high-niobium titanium-aluminum alloy sample. Compared with the common titanium-aluminum alloy, grains of the alloy can be further refined, the strength and rigidity of the alloy can be further improved, and the alloy has good oxidation resistance and creep resistance, and can overcome the disadvantages of poorer room-temperature brittleness and room-temperature ductility. In addition, as the optical float-zone method is adopted for the directional solidification, an oriented lamellar structure can be obtained, properties of the alloy, such as fracture toughness, creeping strength and room-temperature ductility, can be improved greatly, and the alloy has the advantages that no crucible is required, no pollution is caused, and the growth speed is high.

Description

technical field [0001] The invention belongs to the field of high-temperature alloys, in particular to a lamellar high-niobium-titanium aluminum alloy added with carbon silicon tungsten and yttrium and a preparation method thereof. technical background [0002] With the development of aerospace, automotive and other industrial fields, people are usually constrained by the performance limit of materials when pursuing higher efficiency and higher performance, and cannot further meet the requirements for material performance. Therefore, the development and utilization of new materials is imminent. In the field of high-temperature alloys, high-temperature intermetallic compounds have the advantages of low density, high melting point, specific strength and high-temperature strength, and good oxidation resistance and creep resistance. Therefore, the emergence of high-temperature intermetallic compounds has made people see new hope. It is hoped that the study of high-temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C14/00C22C1/02C22F1/18C22F1/02
Inventor 李永胜庞玉璇
Owner NANJING UNIV OF SCI & TECH
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