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TiAl-based composite material and thermal mechanical treatment method thereof

A technology of thermomechanical treatment and composite materials, which is applied in the field of composite material preparation, can solve the problems of difficulty in preparing high-strength plastic TiAl-based composite materials, high brittleness, etc., and achieve the effect of improving thermal processing performance and refining casting structure

Pending Publication Date: 2020-01-03
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a TiAl-based composite material and its thermomechanical treatment method to solve the problem that the interface reaction between the TiAl-based composite material matrix and the reinforcement or the relatively brittleness caused by stress concentration near the interface makes it difficult to prepare high-strength plastic TiAl. Technical issues with matrix composites

Method used

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  • TiAl-based composite material and thermal mechanical treatment method thereof
  • TiAl-based composite material and thermal mechanical treatment method thereof
  • TiAl-based composite material and thermal mechanical treatment method thereof

Examples

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Embodiment 1

[0039] In the present invention, an appropriate amount of B element is added to the TiAl alloy, and elongated TiB is self-generated in situ on the TiAl alloy matrix by ingot smelting 2 whiskers, and through subsequent thermomechanical treatment, prepared into TiB2 / TiAl composites. TiB in composites 2 The phase is L→β+TiB during the solidification of liquid metal 2 and L+β→α+TiB 2 Elongated secondary TiB grown by coupling eutectic reaction and matrix in situ 2 Whiskers (see figure 1 shown), the whiskers are about 0.5 μm in width and tens of microns in length.

[0040] TiB of the present invention 2 / TiAl composites can be produced in the following ways:

[0041] TiB of this embodiment 1 2 / TiAl composites were prepared by the following steps:

[0042] TiB 2 The / TiAl composite material uses zero-grade sponge titanium, A00-grade high-purity aluminum, metal Cr, Al-Nb master alloy, Al-Ta master alloy, Al-Si master alloy and Al-Ti-B master alloy as raw materials. Contain...

Embodiment 2

[0053] TiB of Example 2 2 / TiAl composites were prepared by the following steps:

[0054] TiB of Example 2 2 / TiAl composite materials are made of zero-grade sponge titanium, A00 grade high-purity aluminum, metal Cr, Al-Nb master alloy and TiB 2 powder. Contains by atomic percentage: 44% Al, 0.8% B, 1% Cr, 4% Nb, 0.2% Ta, and the rest is Ti.

[0055] After the raw materials are mixed evenly, they are pressed into an electrode block on a press. After the electrode block is welded, three times of melting are carried out in the vacuum consumable melting furnace. The melting vacuum is lower than 5Pa. The melting current is controlled within the range of 3kA~6kA according to the size of the ingot, and the melting voltage is 23~25V. After three times of melting, the diameter Φ220mm casting ingot.

[0056] TiB 2 / TiAl composite material casting ingot for sheath extrusion deformation, sheath material is made of stainless steel, sheath and TiB 2 Heat insulation material is added...

Embodiment 3

[0064] TiB of Example 3 2 / TiAl composites were prepared by the following steps:

[0065] TiB of Example 3 2 / TiAl composite materials are made of zero-grade sponge titanium, A00 grade high-purity aluminum, metal Cr, Al-Nb master alloy and TiB 2 powder. Contains by atomic percentage: 42% Al, 0.5% B, 1.5% Cr, 5% Nb, 0.2% Ta, and the rest is Ti.

[0066] After the raw materials are mixed evenly, they are pressed into an electrode block on a press. After the electrode block is welded, three times of melting are carried out in a vacuum consumable melting furnace. The melting vacuum is lower than 5Pa. The melting current is controlled within the range of 3kA~6kA according to the size of the ingot, and the melting voltage is 23~25V. After three times of melting, a casting with a diameter of Φ300mm ingot.

[0067] TiB 2 / TiAl composite material casting ingot for sheath extrusion deformation, sheath material is made of stainless steel, sheath and TiB 2 Heat insulation material ...

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Abstract

The invention relates to a TiAl-based composite material enhanced by a TiB2 crystal whisker self-generated in situ as well as a thermal mechanical treatment method thereof. A proper amount of elementB is added in TiAl alloy according to an element B adding control quantity calculation formula, a slight secondary TiB2 crystal whisker is self-generated in situ through eutectic reaction of L->beta+TiB2 and L+beta->alpha+TiB2 and generation of thick granular primary TiB2 phase is avoided, so that the TiB2 crystal whisker enhanced TiAl-based composite material can be prepared by a ingot metallurgymethod. Then, the TiB2 / TiAl composite material can be prepared into a thin crystal bar material or a thin crystal cake blank through package sheathing hot extrusion or package sheathing forging, theslight TiB2 crystal whisker is crushed into short crystal whiskers, and a thin crystal mesh basket-shaped tissue or a thin crystal full-slice-sheet tissue can be obtained through treatment by a special heat treatment process. The TiB2 / TiAl composite material has high strength from room temperature to high temperature (850 DEG C) and has excellent room-temperature plasticity, so the TiB2 / TiAl composite material has good prospect in the field of aerospace.

Description

technical field [0001] The invention belongs to the field of composite material preparation, and relates to a TiAl-based composite material and a thermomechanical treatment method thereof, in particular to an in-situ self-generated TiB2 whisker-reinforced TiAl-based composite material and a thermal processing and heat treatment method thereof. 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. [0003] By adding granular and fibrous reinforcements to TiAl alloys to prepare TiAl-based composites, the high-temperature strength and high-temperature durability of TiAl alloys can be improved. However, since...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C32/00C22C1/02C22F1/18
CPCC22C1/02C22C14/00C22C32/0073C22F1/183
Inventor 李臻熙高帆齐立春刘宏武
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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