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Preparation method of TiAl-based composite material with high product of strength and elongation

A technology of composite materials and high-strength plastic products, which is applied in the field of processing and preparation of titanium-aluminum intermetallic compound-based composite materials, can solve problems such as complex process routes and single reinforcement principles, and achieve the goal of improving plastic deformation capacity, increasing energy, and avoiding interface defects. Effect

Active Publication Date: 2020-03-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current preparation methods of TiAl intermetallic compound matrix composites generally have the defects of complex process route and single reinforcement principle.

Method used

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  • Preparation method of TiAl-based composite material with high product of strength and elongation
  • Preparation method of TiAl-based composite material with high product of strength and elongation
  • Preparation method of TiAl-based composite material with high product of strength and elongation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The Ti-45Al-5Nb-0.3W (at%) pre-alloyed powder prepared by the rotating electrode method with an atomic composition ratio of 98% and the Nb element powder with an atomic composition ratio of 2% were fully mixed in a V-type mixer 6 hours. Among them, the TiAl pre-alloyed powder is -100 mesh powder, the oxygen content is 780 ppm, and the Nb element powder is -200 mesh to -100 mesh, and the oxygen content is 450 ppm. Then put the fully mixed Nb element powder and TiAl alloy powder into a Φ100mm×200mm stainless steel sheath, vibrate, seal and then vacuumize at 520°C for 2.5 hours. The vacuum-pumped airtight tank was subjected to hot isostatic pressing for 5 hours at a temperature of 1260° C. and a pressure of 152 MPa, and then cooled in the furnace. Then a cylindrical billet with a size of Φ65mm×70mm was cut from the hot isostatic pressed billet, and packaged into a stainless steel sheath with a size of Φ85mm×110mm. Evenly coat the surface of the billet with anti-oxidation...

Embodiment 2

[0048] The Ti-45Al-5Nb-0.3W (at%) pre-alloyed powder prepared by the rotating electrode method with an atomic composition ratio of 95% and the Nb element powder with an atomic composition ratio of 5% were fully mixed in a V-type mixer 8 hours. Among them, the TiAl pre-alloyed powder is -100 mesh powder, the oxygen content is 780 ppm, and the Nb element powder is -200 mesh to -100 mesh, and the oxygen content is 450 ppm. Then put the fully mixed Nb element powder and TiAl alloy powder into a Φ100mm×200mm stainless steel sheath, vibrate, seal and then vacuumize at 550°C for 3 hours. The sealed tank that has been vacuumed is subjected to hot isostatic pressing at a temperature of 1255° C. and a pressure of 155 MPa for 5.5 hours, and then cooled in the furnace. Then a cylindrical billet with a size of Φ65mm×70mm was cut from the hot isostatic pressed billet, and packaged into a stainless steel sheath with a size of Φ85mm×110mm. Evenly coat the surface of the billet with anti-oxi...

Embodiment 3

[0050] The Ti-45Al-5Nb-0.3W (at%) pre-alloyed powder prepared by the rotating electrode method with an atomic composition ratio of 99% and the Nb element powder with an atomic composition ratio of 1% are fully mixed in a V-shaped mixer 5 hours. Among them, the TiAl pre-alloyed powder is -100 mesh powder, the oxygen content is 780 ppm, and the Nb element powder is -200 mesh to -100 mesh, and the oxygen content is 450 ppm. Then put the fully mixed Nb element powder and TiAl alloy powder into a Φ100mm×200mm stainless steel sheath, vibrate, seal and then vacuumize at 550°C for 2 hours. The vacuum-pumped sealed tank was subjected to hot isostatic pressing for 5.5 hours at a temperature of 1265° C. and a pressure of 150 MPa, and then cooled in the furnace. Then a cylindrical billet with a size of Φ65mm×70mm was cut from the hot isostatic pressed billet, and packaged into a stainless steel sheath with a size of Φ85mm×110mm. Evenly coat the surface of the billet with anti-oxidation ...

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Abstract

The invention discloses a preparation method of a TiAl-based composite material with high product of strength and elongation, and belongs to the technical field of processing and preparation of titanium-aluminum intermetallic compound-based composite materials. The preparation method comprises the steps of fully mixing TiAl pre-alloyed powder and Nb element powder; putting the mixed powder into asheath, sealing, vacuumizing, and carrying out hot isostatic pressing treatment to obtain a TiAl-based composite material blank; and carrying out high-temperature sheath hot extrusion on the obtainedhot isostatic pressing blank at 1240-1260 DEG C, and removing the sheath after the hot extrusion is finished, thereby obtaining the fibrous tough Nb-rich phase and granular Ti2AlNb phase composite reinforced high product of strength and elongation TiAl intermetallic compound-based composite material. The TiAl intermetallic compound-based composite material prepared by the invention has higher product of strength and elongation than the conventional TiAl within the use temperature range of 800-850 DEG C. The preparation method is simple in technological process, low in equipment requirement andsuitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of a titanium-aluminum intermetallic compound-based composite material, which is a high-toughness multi-phase composite reinforced titanium-aluminum intermetallic compound-based composite material; it belongs to the technical field of processing and preparing titanium-aluminum intermetallic compound-based composite materials. Background technique [0002] Titanium-aluminum intermetallic compound is a light-weight high-temperature structural material. It has been widely used in aerospace and automobile industries, and has shown its remarkable advantages. However, due to the intrinsic brittleness of titanium-aluminum intermetallic compound and limited The high-temperature comprehensive mechanical properties (strength and plasticity), especially the insufficient high-temperature toughness, severely limit its large-scale application. The strength-plasticity product (strength × plasticity), as a comprehensive pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/04B22F3/15B22F3/20
CPCB22F3/15B22F3/20B22F2003/208C22C1/0458C22C14/00C22C30/00
Inventor 梁霄鹏刘镇琦李慧中刘咏
Owner CENT SOUTH UNIV
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