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High-density Ti2AlNb powder alloy near-net forming technology

A powder alloy, near-net forming technology, applied in the field of powder metallurgy forming of lightweight and high-strength titanium-aluminum intermetallic compounds, can solve the problems of large dispersion, high degree of AlNb alloying, low room temperature plasticity, etc., and achieve good performance consistency , The effect of uniform organization and meeting application requirements

Inactive Publication Date: 2016-06-15
SINO EURO MATERIALS TECH OF XIAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ti 2 AlNb has a high degree of alloying, and is prone to macroscopic component segregation during the melting process, and casting defects such as shrinkage cavities and porosity during the solidification process, low plasticity at room temperature and large dispersion
Currently preparing Ti 2 The main method of AlNb alloy components is the method of ingot thermal deformation + machining, and the uneven distribution of forging genetic structure will easily lead to cracks in subsequent machining

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of highly dense Ti 2 AlNb powder alloy near net shape process, including the following steps:

[0019] 1) According to Ti 2 The composition of AlNb-based alloys is ingredients, Ti: 47.1wt%, Al: 10.6wt%, Nb: 41.3wt%, Mo: 1.0wt%, and smelted into Ti 2 AlNb alloy rod;

[0020] 2) Ti 2 AlNb alloy rods are loaded into the plasma rotating electrode powder making equipment, and the alloy rods are made into Ti under the protection of inert gases such as helium or argon. 2 AlNb spherical powder;

[0021] 3) The prepared Ti 2 AlNb spherical powder is loaded into a stainless steel sheath, and the sheath is vibrated during the powder filling process to make the powder reach a state of vibration;

[0022] 4) For loading Ti 2 AlNb spherical powder and vibrated package for degassing process, the degassing temperature is 230 ℃, the vacuum degree is 8.6*10 -3 Pa;

[0023] 5) Perform hot isostatic pressing on the degassed sheath, the method of temperature rise and pressur...

Embodiment 2

[0026] A kind of highly dense Ti 2 AlNb powder alloy near net shape process, including the following steps:

[0027] 1) According to Ti 2 The composition of AlNb-based alloy is ingredients, Ti: 39.64wt%, Al: 9.64wt%, Nb: 30.16wt%, Ta: 20.56wt%, and smelted into Ti 2 AlNb alloy rod;

[0028] 2) Ti 2 AlNb alloy rods are loaded into the plasma rotating electrode powder making equipment, and the alloy rods are made into Ti under the protection of inert gases such as helium or argon. 2 AlNb spherical powder;

[0029] 3) The prepared Ti 2 AlNb spherical powder is loaded into a low-carbon steel ladle, and the ladle is vibrated during the powder loading process to make the powder reach a state of vibration;

[0030] 4) For loading Ti 2 AlNb spherical powder and vibrated package for degassing process, the degassing temperature is 170 ℃, the vacuum degree is 9.7*10 -3 Pa;

[0031] 5) Perform hot isostatic pressing on the degassed sheath. The method of temperature and pressure i...

Embodiment 3

[0034] A kind of highly dense Ti 2 AlNb powder alloy near net shape process, including the following steps:

[0035] 1) According to Ti 2 The composition of AlNb-based alloy is ingredients, Al: 10.08wt%, Nb: 44.35wt%, Ti: 45.57wt%, and smelted into Ti 2 AlNb alloy rod;

[0036] 2) Ti 2 AlNb alloy rods are loaded into the plasma rotating electrode powder making equipment, and the alloy rods are made into Ti under the protection of inert gases such as helium or argon. 2 AlNb spherical powder;

[0037] 3) The prepared Ti 2 AlNb spherical powder is loaded into a low-carbon steel ladle, and the ladle is vibrated during the powder loading process to make the powder reach a state of vibration;

[0038] 4) For loading Ti 2 AlNb spherical powder and vibrated package for degassing process, the degassing temperature is 120 ℃, the vacuum degree is 1.1*10 -2 Pa;

[0039] 5) Perform hot isostatic pressing on the degassed sheath. The method of temperature and pressure increase is to...

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Abstract

The invention provides a high-density Ti2AlNb powder alloy near-net forming technology.The technology comprises the following steps that 1, a Ti2AlNb alloy bar is smelted by taking components of Ti2AlNb-based alloy as ingredients; 2, the alloy bar processed through finish turning is put into plasma rotation electrode powder preparing equipment, and the Ti2AlNb alloy bar is prepared into Ti2AlNb spherical powder under the inert gas shielding condition; 3, the prepared Ti2AlNb spherical powder is located into a stainless steel or low-carbon steel sheath; 4, the sheath which contains the Ti2AlNb spherical powder and is compacted through vibration is degassed; 5, hot isostatic pressing forming is performed on the degassed sheath.The Ti2AlNb powder alloy prepared through the method has the isotropic character and is high in density degree, uniform in tissue and component, excellent in mechanical property and capable of achieving Ti2AlNb alloy parts with the large size and complex shapes.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy forming of light-weight and high-strength titanium-aluminum intermetallic compounds, and in particular relates to a high-density Ti 2 AlNb powder alloy near net shape process. Background technique [0002] Ti 2 AlNb is an intermetallic compound alloy based on an ordered orthorhombic structure O phase, the composition is usually in the range of Ti-(18-30)Al-(12.5-30)Nb, and contains a small amount of alloying elements such as Mo, V and Ta . Because the long-range ordered superlattice structure weakens dislocation movement and high-temperature diffusion, the alloy not only has high specific strength and specific stiffness, but also has high-temperature creep resistance, high fracture toughness, good oxidation resistance, and thermal expansion coefficient. Low-level characteristics, so it has become the most potential new lightweight high-temperature structural material for aerospace. ...

Claims

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Application Information

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IPC IPC(8): B22F9/10B22F3/15C22C30/00C22C1/04
CPCC22C1/0458C22C14/00C22C30/00B22F3/15B22F9/10B22F2998/10C22C1/047
Inventor 左振博赵霄昊韩志宇王庆相梁书锦张平祥闫飞相敏王琦莫茗焜
Owner SINO EURO MATERIALS TECH OF XIAN CO LTD
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