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High-fracture-toughness two-state titanium-aluminum-based composite material and preparation method thereof

A composite material, high-fracture technology, applied in the preparation of titanium-aluminum matrix composite materials, high fracture toughness two-state titanium-aluminum matrix composite materials and its preparation field, can solve the problems of low density, poor plasticity and strength, etc., to achieve The effects of short production cycle, improved tissue density, and easy operation of the preparation method

Inactive Publication Date: 2019-03-29
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a high fracture toughness two-state titanium-aluminum matrix composite material and its preparation method to solve the problem of poor fracture toughness, plasticity and strength of existing titanium-aluminum-based alloys Issues with lower density, limiting its range of applications

Method used

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  • High-fracture-toughness two-state titanium-aluminum-based composite material and preparation method thereof
  • High-fracture-toughness two-state titanium-aluminum-based composite material and preparation method thereof

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Effect test

Embodiment 1

[0025] 1) Using φ75mm×400mm as-cast Ti-40Al-5Nb-0.4W ingot as electrode material for plasma rotary electrode processing and rotary atomization at a speed of 16000r / min, preparation and screening of pre-alloys with an average particle size of about 80μm powder, and then mix it with Nb element powder with an average particle size of about 100 μm for about 1 hour, wherein the atomic ratio of pre-alloyed powder and Nb element is 98:2;

[0026] 2) Put the mixed powder obtained in step 1) into a stainless steel tank of 450mm×400mm×120mm, seal the stainless steel tank and degas at 500°C for 12h, and then prepare the original compact by hot isostatic pressing. The technological parameters of the pressing are: the temperature is 1250℃, the pressure is 170MPa, and the holding time is 5h;

[0027] 3) Cut the original billet into cylindrical samples of φ50mm×80mm, put the samples into 1.5mm thick tanks made of special steel for degassing, and wrap them at 1200℃ with 80% engineering strain...

Embodiment 2

[0029] 1) Using φ75mm×400mm as-cast Ti-50Al-10Nb-0.4W ingot as electrode material for plasma rotating electrode processing and rotary atomization at a speed of 16000r / min to prepare and screen a pre-alloy with an average particle size of about 80μm powder, and then mix it with Nb element powder with an average particle size of about 100 μm for about 4 hours, wherein the atomic ratio of pre-alloyed powder and Nb element is 95:5;

[0030] 2) Put the mixed powder obtained in step 1) into a stainless steel tank of 450mm×400mm×120mm, seal the stainless steel tank and degas at 500°C for 12h, and then prepare the original compact by hot isostatic pressing. The technological parameters of the pressing are: the temperature is 1250℃, the pressure is 170MPa, and the holding time is 5h;

[0031] 3) Cut the original billet into a cylindrical sample of φ50mm×80mm, put the sample into a 1.5mm thick tank made of special steel for degassing, and wrap it at 1300°C with an engineering strain of ...

Embodiment 3

[0033]1) Using φ75mm×400mm as-cast Ti-45Al-5Nb-0.4W ingot as electrode material for plasma rotating electrode processing and rotary atomization at a speed of 16000r / min, preparation and screening of pre-alloys with an average particle size of about 80μm powder, and then mix it with Nb element powder with an average particle size of about 100 μm for about 4 hours, wherein the atomic ratio of pre-alloyed powder and Nb element is 98:2;

[0034] 2) Put the mixed powder obtained in step 1) into a stainless steel tank of 450mm×400mm×120mm, seal the stainless steel tank and degas at 500°C for 12h, and then prepare the original compact by hot isostatic pressing. The technological parameters of the pressing are: the temperature is 1250℃, the pressure is 170MPa, and the holding time is 5h;

[0035] 3) Cut the original billet into cylindrical samples of φ50mm×80mm, put the samples into 1.5mm thick tanks made of special steel for degassing, and wrap them at 1200℃ with 80% engineering stra...

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Abstract

The invention discloses a high-fracture-toughness two-state titanium-aluminum-based composite material and a preparation method thereof. The high-fracture-toughness two-state titanium-aluminum-based composite material is prepared from, by atomic percentage components, 2-5% of Nb element powder and balance Ti-XAl-YNb-0.4W (at.%) prealloyed powder, wherein X is 40-50, and Y is 5-10. The toughened high Nb-TiAl composite material containing plastic Nb particles is prepared through a powder metallurgy technology and canned forging, the preparation method is simple and easy to operate, and the preparation process is simple. The structure of the prepared two-state titanium-aluminum-based composite material contains fine gamma-TiAl matrix structure and the Nb particles of which the sizes are abot100 micros and randomly distributed in the matrix structure, and the Nb particles are composed by pure Nb phases and beta phases and strip-shaped omega phases which surround the pure Nb phases, so that the crack propagation in the titanium-aluminum-based alloy is effectively delayed, thereby improving the fracture toughness, strength and plasticity of the composite material, and therefore the high-fracture-toughness two-state titanium-aluminum-based composite material is expected to be used for aerospace high-temperature structural components, and the application range of the titanium-aluminum-based composite material is effectively widened.

Description

technical field [0001] The invention relates to a preparation method of a titanium-aluminum-based composite material, in particular to a high fracture toughness dual-state titanium-aluminum-based composite material and a preparation method thereof, belonging to the technical field of titanium-aluminum material processing. Background technique [0002] As an advanced high-temperature structural material, titanium-aluminum-based alloy materials are superior to the currently widely used metals and their alloys due to their low density, good high-temperature strength, high oxidation resistance and creep resistance. A promising high-temperature structural material. At present, it has attracted much attention in industrial fields such as aerospace, automobile and energy. Among them, PM-TiAl-based alloy materials are widely used as a kind of important titanium-aluminum-based alloy materials, and are also a research hotspot for many years. [0003] Powder metallurgy technology can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C14/00C22C30/00C22C21/00
CPCC22C1/04C22C1/0416C22C1/0458C22C14/00C22C21/003C22C30/00
Inventor 李建波张紫妍鲁小芳陈先华潘复生
Owner CHONGQING UNIV
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