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7XXX series in-situ aluminum-based composite material powder for laser additive manufacturing and preparation

An aluminum matrix composite material, laser additive technology, applied in the direction of additive processing, etc., can solve the problems of insufficient reliability, high residual stress cracks and holes, material fatigue strength, plasticity and toughness reduction, etc., to expand the application range of materials , Improve the laser absorption rate, inhibit the effect of recrystallization growth

Inactive Publication Date: 2018-07-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prepared parts are prone to high residual stress and defects such as micron-level cracks and holes, which will lead to the reduction of fatigue strength, plasticity and toughness of the material.
Therefore, the production yield of parts is low, the reliability is insufficient and the cost remains high
Therefore, traditional commercial alloy powders cannot fully meet the requirements for the manufacture of high-performance components.

Method used

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  • 7XXX series in-situ aluminum-based composite material powder for laser additive manufacturing and preparation
  • 7XXX series in-situ aluminum-based composite material powder for laser additive manufacturing and preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Experiments were carried out with high-purity Al, industrial pure Mg, industrial pure Zn, Al-50Cu, Al-12Zr master alloy, KBF 4 and K 2 TiF 6 The in-situ self-generated 5wt.%TiB2 reinforced Al-6.7Zn-2.2Mg-2.3Cu-0.1Zr composite was prepared as the raw material. Put high-purity Al into the crucible to melt and heat up to 780°C, and cover it with JZF-03 high-temperature covering agent; put KBF 4 、K 2 TiF 6 After mixing evenly according to the mass ratio of 1:2, add it to the melt after drying; after the reaction is finished, take out the reaction by-products, add Al-50Cu, Al-12Zr master alloy, industrial pure Mg, and industrial pure Zn in sequence, Add JZJ type harmless aluminum alloy refining agent to the body for degassing refining, let stand at 750°C for 15 minutes, and then gas atomize to make powder. Its aerosolization equipment such as figure 1 As shown, the specific process is as follows: the solution temperature is 820°C, He is used for protection and gas atom...

Embodiment 2

[0045] Experiments were carried out with high-purity Al, industrial pure Mg, industrial pure Zn, Al-50Cu, Al-12Zr master alloy, KBF 4 and K 2 TiF 6 In situ self-generated 5wt.%TiB was formulated for the raw material 2 Reinforced Al-6.6Zn-2.2Mg-2.2Cu-0.09Zr composites. Put high-purity Al into the crucible to melt and heat up to 780°C, and cover it with JZF-03 high-temperature covering agent; put KBF 4 、K 2 TiF 6 After mixing evenly according to the mass ratio of 1:2, add it to the melt after drying; after the reaction is finished, take out the reaction by-products, add Al-50Cu, Al-12Zr master alloy, industrial pure Mg, and industrial pure Zn in sequence, Add JZJ type harmless aluminum alloy refining agent to the body for degassing refining, let stand at 750°C for 15 minutes, and then gas atomize to make powder. The gas atomization process is as follows: the solution temperature is 900°C, He is used for protection and gas atomization, the air pressure is 3.10 MPa, and the ...

Embodiment 3

[0047] Experiments were carried out with high-purity Al, industrial pure Mg, industrial pure Zn, Al-50Cu, Al-12Zr master alloy, KBF 4 and K 2 TiF 6 The in-situ self-generated 5wt.%TiB2 reinforced Al-6.6Zn-2.2Mg-2.2Cu-0.09Zr composite was prepared as the raw material. Put high-purity Al into the crucible to melt and heat up to 780°C, and cover it with JZF-03 high-temperature covering agent; put KBF 4 、K 2 TiF 6 After mixing evenly according to the mass ratio of 1:2, add it to the melt after drying; after the reaction is finished, take out the reaction by-products, add Al-50Cu, Al-12Zr master alloy, industrial pure Mg, and industrial pure Zn in sequence, Add JZJ type harmless aluminum alloy refining agent to the body for degassing refining, let stand at 750°C for 15 minutes, and then gas atomize to make powder. The gas atomization process is as follows: the solution temperature is 900°C, Ar protection is used for gas atomization, the air pressure is 1.20 MPa, and the nozzle...

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Abstract

The invention provides a preparation method of 7XXX series in-situ aluminum-based composite material powder for laser additive manufacturing. The preparation method comprises the following steps: heating commercially pure aluminum; after covering with a high-temperature covering agent, raising the temperature and smelting; uniformly mixing KBF4 and K2TiF6; after drying, adding a mixture into a melt; after reacting, sequentially adding a needed intermediate alloy, commercially pure Mg and commercially pure Zn; adding a refining agent into the melt and carrying out degassing and refining; then carrying out gas atomization to obtain the 7XXX series in-situ aluminum-based composite material powder. According to the method provided by the invention, an in-situ TiB2 micron-nano-sized particle enhanced 7XXX series composite material is prepared by adopting an in-situ melt automatic generation and high-temperature gas atomization method; TiB2 particle enhanced aluminum-based composite materialpowder is prepared; TiB2 particles are uniformly dispersed in an aluminum matrix. The aluminum-based composite material powder prepared by the method has a good laser absorption rate and is suitablefor a laser additive manufacturing technology.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a 7XXX series aluminum-based composite material powder for laser additive manufacturing and a preparation method thereof. Background technique [0002] With the development of modern science and technology, the requirements for material performance and preparation technology in practical applications have become more stringent. Especially in high-tech fields such as aerospace and weapon manufacturing, structural materials should have high specific stiffness and specific modulus while requiring high strength and high plasticity. The pursuit of high performance, high reliability, economy and environmental protection in the field of high-end equipment such as large aircraft has led to an increasingly urgent demand for large, sophisticated and complex overall lightweight, high-strength and tough alloy components. Laser additive manufacturing technology can s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06C22C21/00C22C32/00B22F9/08B33Y70/00
CPCC22C1/03B22F9/082B22F2009/0848B33Y70/00C22C1/026C22C1/06C22C21/00C22C32/0073
Inventor 陈哲吴一廉清汪明亮王浩伟
Owner SHANGHAI JIAO TONG UNIV
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