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In-situ self-generated TiB2 whisker-reinforced TiAl-based composite material and preparation method thereof

A composite material and in-situ technology, which is applied in the field of preparation of TiAl alloys and composite materials with TiAl alloys as the matrix, can solve the problems of reduced room temperature plasticity, reduced performance of composite materials, difficulty in preparing TiAl matrix composite materials, etc., and achieves good room temperature. The effect of plasticity, excellent high temperature creep resistance, and excellent high temperature durability

Inactive Publication Date: 2018-09-28
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the room temperature plasticity of TiAl alloy is only 1-2%, adding reinforcements to TiAl alloy will further reduce the room temperature plasticity, so it is often difficult to prepare large-sized TiAl-based composite materials.
The reinforcement and matrix of TiAl-based composites often undergo strong interfacial reactions during the preparation process, resulting in a significant decrease in the performance of the composites

Method used

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  • In-situ self-generated TiB2 whisker-reinforced TiAl-based composite material and preparation method thereof
  • In-situ self-generated TiB2 whisker-reinforced TiAl-based composite material and preparation method thereof
  • In-situ self-generated TiB2 whisker-reinforced TiAl-based composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0051] TiB of this embodiment 1 2 / TiAl composites were prepared by the following steps:

[0052] 1. TiB 2 The / TiAl composite material uses zero-grade sponge titanium, A00-grade high-purity aluminum, metal Cr, Al-Nb master alloy, Al-W master alloy, Al-Si master alloy and boron powder as raw materials. Contains by atomic percentage: 47.5% Al, 1% Cr, 4% Nb, 0.2% W, 0.2% Si, 1% B, and the rest is Ti. The Al content and B content of the composite material in this example fall in figure 1 In the shaded part, the composition range defined by formula (1) is satisfied, so TiB can be generated in situ 2 whiskers, see Figure 4 shown.

[0053] 2. After mixing the raw materials evenly, press them into an electrode block on a press. After the electrode block is welded, the first melting is carried out in a vacuum consumable melting furnace, the melting vacuum is lower than 5Pa, the melting current is 1.5KA, the melting voltage is 24V, and the primary ingot with a diameter of Φ100mm...

Embodiment 2

[0059] TiB of this embodiment 2 2 / TiAl composites were prepared by the following steps:

[0060] 1. TiB 2 / TiAl composite material uses zero-grade sponge titanium, A00 grade high-purity aluminum, metal Cr, Al-Nb master alloy and boron powder as raw materials. Contains by atomic percentage: 47% Al, 2% Cr, 2% Nb, 1% B, and the rest is Ti. The Al content and B content of the composite material in this example fall in figure 1 In the shaded part, the composition range defined by formula (1) is satisfied.

[0061] 2. After mixing the raw materials evenly, press them into an electrode block on a press. After the electrode blocks are welded, the first melting is carried out in a vacuum consumable melting furnace, the melting vacuum is lower than 5Pa, the melting current is 3.5KA, the melting voltage is 25V, and a primary ingot with a diameter of Φ220mm is melted.

[0062] 3. Put TiB 2The primary ingot of / TiAl composite material is placed in a vacuum consumable solidification ...

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Abstract

The invention belongs to the field of preparation of a TiAl alloy and a composite material adopting the TiAl alloy as a matrix, and relates to an in-situ self-generated TiB2 whisker-reinforced TiAl-based composite material and a preparation method thereof. The invention is applicable to the TiB2 / TiAl composite material and the preparation method thereof. Through a formula for calculating the controlled quantity of B elements added into the TiAl alloy mentioned by the invention, the appropriate amount of B elements is added into the TiAl alloy, an in-situ self-generated slim secondary TiB2 whisker obtained through the eutectic reaction of L to beta+TiB2 and L+beta to alpha+TiB2 is formed in the TiAl alloy, and meanwhile, the production of a thick granular primary TiB2 phase is avoided, so that the TiB2 whisker-reinforced TiAl-based composite material can be obtained. Then, the TiB2 / TiAl composite material prepared through an ingot metallurgy method is treated through a unique triple heat treatment process, so that a fine-grain mesh basket-shaped structure and a fine-grain full lamellar structure can be obtained. The TiB2 / TiAl composite material has excellent creep resistance and durability at the high temperature of 760 DEG C to 800 DEG C, and meanwhile, has better room-temperature ductility so as to have a favorable application prospect in the aerospace field.

Description

technical field [0001] The invention belongs to the field of preparation of TiAl alloys and composite materials with TiAl alloys as the matrix, and relates to an in-situ self-generated TiB 2 Whisker-reinforced TiAl-based composite material and its preparation method. Background technique [0002] γ-TiAl-based intermetallic compound alloy has excellent properties such as low density, high specific strength, high specific modulus, high creep resistance, oxidation resistance, and combustion resistance. Therefore, it has attracted much attention as a new generation of high-temperature structural materials. Become a key material for a new generation of high thrust-to-weight ratio aero-engines. How to improve the high temperature creep resistance and durability of TiAl alloy has always been the focus of TiAl alloy research. [0003] By adding granular and fibrous reinforcements to TiAl alloys to prepare TiAl-based composites, the high-temperature mechanical properties of TiAl al...

Claims

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Application Information

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IPC IPC(8): C22C47/00C22C49/12C22C49/14C22C101/22
Inventor 李臻熙齐立春高帆刘宏武
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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