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Composite reinforced high strength and high elastic modulus titanium alloy and preparation method thereof

A technology of titanium alloy and high elasticity, which is applied in the field of composite strengthened high-strength and high-elastic modulus titanium alloy and its preparation, can solve the problems of easy segregation, limited application range, complicated process, etc., achieve good interface bonding, improve Excellent wear resistance and comprehensive mechanical properties

Inactive Publication Date: 2009-03-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Through the retrieval of prior art documents, it is found that the Chinese patent (disclosure) number is CN1978681, and the patent name is a titanium alloy with high strength and high modulus of elasticity. Although the titanium alloy with high strength and high modulus of elasticity has been obtained, the cost of the alloying elements of the titanium alloy used is high; the process of adding a reinforcing phase is complicated, the interface is poorly bonded, and segregation is prone to occur; at the same time, the patent A single TiB reinforcement phase is used, so the performance of the obtained titanium alloy is single, which limits its application range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A composite strengthened high-strength high-elastic modulus titanium alloy (TiB:TiC=1:1) with a volume fraction of the reinforcing phase of 5% was prepared.

[0028] Weighing 89.51% of primary sponge titanium, 0.62% of boron carbide, 0.40% of graphite, 6.89% of aluminum vanadium master alloy (V content is 55%) and 2.58% of pure aluminum according to the mass percentage, the preparation composition is Ti-5.7Al-3.8V- 0.48B-0.54C titanium alloy.

[0029] Mix the raw materials evenly, press them into electrodes, and put them into a vacuum consumable electric arc furnace or a vacuum non-consumable electric arc furnace; smelt two to three times to obtain titanium alloy ingots containing reinforced phases TiB and TiC; carry out in the β phase region Open billet forging (1170°C) with a deformation of 50%, then conventional forging in the α+β two-phase region (1020°C) with a deformation of 75%, using machining equipment to remove oxide scales and shrinkage cavities on the surfac...

Embodiment 2

[0032] Preparation of a composite strengthened high-strength high-elastic modulus titanium alloy (TiB:TiC=4:1) with a reinforcement phase volume fraction of 4%

[0033] Weighing 88.39% of primary sponge titanium, 0.77% of boron carbide, 0% of graphite, 7.19% of aluminum vanadium master alloy (V content is 60%) and 3.64% of pure aluminum according to the mass percentage, the preparation composition is Ti-6.5Al-4.3V- 0.61B-0.17C titanium alloy.

[0034] Mix the raw materials evenly, press them into electrodes, and put them into a vacuum consumable electric arc furnace or a vacuum non-consumable electric arc furnace; smelt two to three times to obtain titanium alloy ingots containing reinforced phases TiB and TiC; carry out in the β phase region Open billet forging (1080°C), with a deformation of 60%, and then perform conventional forging in the α+β two-phase region (980°C), with a deformation of 85%, and use machining equipment to remove oxide scales and shrinkage cavities on th...

Embodiment 3

[0037] Preparation of Composite Strengthened High Strength and High Elastic Modulus Titanium Alloy (TiB:TiC=4:1) with Reinforcing Phase Volume Fraction of 6%

[0038] Weighing 88.24% of primary sponge titanium, 1.16% of boron carbide, 0% of graphite, 8.44% of aluminum vanadium master alloy (V content is 50%) and 2.16% of pure aluminum according to the mass percentage, the preparation composition is Ti-6.4Al-4.2V- 0.91B-0.25C titanium alloy.

[0039] Mix the raw materials evenly, press them into electrodes, and put them into a vacuum consumable electric arc furnace or a vacuum non-consumable electric arc furnace; smelt two to three times to obtain titanium alloy ingots containing reinforced phases TiB and TiC; carry out in the β phase region Open billet forging (1160°C) with a deformation of 50%, then conventional forging in the α+β two-phase region (1010°C) with a deformation of 80%, using machining equipment to remove oxide scales and shrinkage cavities on the surface of the ...

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Abstract

The invention discloses a compositely reinforced titanium alloy of high strength and high modulus of elasticity in the material preparation technical field and a preparation method thereof, which contains the following components by mass percent content: 5.1 percent to 6.5 percent of Al, 3.3 percent to 4.3 percent of V, 0.06 percent to 0.91 percent of B, 0.17 percent to 1.27 percent of C, and titanium as the rest. Titanium sponge, boron carbide, graphite, aluminum vanadium hardener and pure aluminum raw material are weighed and mixed evenly to be suppressed into an electrode which is installed in an arc furnace; titanium alloy cast ingot containing TiB and TiC of wild phase is obtained through smelting; billet forging is carried out to the titanium alloy cast ingot in beta phase area, then regular forging is carried out in alpha phase and beta phase, and after the completion of forging, the oxide skin on the surface of the titanium alloy, shrinkage holes, segregation and occluded defects are removed so that the titanium alloy is gotten. The invention is simple and rapid, and has low cost, more even distribution of wild phases, better combination of interfaces, high coefficient of thermal conductivity, low coefficient of linear expansion and outstanding comprehensive mechanical property.

Description

technical field [0001] The invention relates to a titanium alloy in the technical field of metal materials and a preparation method thereof, in particular to a composite strengthened high-strength high-elastic modulus titanium alloy and a preparation method thereof. Background technique [0002] With the rapid development of the aerospace industry, improving aviation efficiency and reducing flight costs have put forward higher requirements for aircraft structural materials. In order to adapt to this development trend, titanium alloys with high strength (tensile strength at room temperature greater than 1000MPa), high elastic modulus (elastic modulus higher than 120GPa) and high toughness are becoming a new type of high-tech new material that has attracted much attention. Structural materials. [0003] Reducing the specific gravity of materials can improve the thrust-to-weight ratio of the aircraft, increase the flight distance and reduce fuel costs. One of the main weight ...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/03C22F1/18
Inventor 吕维洁卢俊强覃继宁张荻
Owner SHANGHAI JIAO TONG UNIV
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